ICU-21469 Remove .travis.yml file now that continuous integration tasks have been moved to GHA.
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index ca33b5b..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,203 +0,0 @@
-matrix:
-  include:
-
-    # ICU4C Docs Build
-    #    TODO: publish the latest built docs from master on GitHub pages.
-    #          See https://gist.github.com/vidavidorra/548ffbcdae99d752da02 for ideas.
-    - name:     "c: docs"
-      dist:     xenial
-      language: cpp
-      addons:
-         apt:
-           update: true
-           packages:
-             - doxygen
-      before_script:
-        - cd icu4c/source
-        - ./runConfigureICU Linux --disable-renaming
-      script:
-        # fail if 'warning:' appears in doxygen's output, but ignore warnings from file Doxyfile.
-        # The Doxygen version from Travis is down-rev, and doesn't recognize some options
-        # in the Doxyfile config file.
-        # Regex note: (?! ... ) is a negative lookahead. Succeed if the pattern is not present.
-        - set +o pipefail && make doc 2>&1 | tee doxygen.log && ( ! grep -P 'warning:(?! .* file Doxyfile)' doxygen.log )
-
-
-    - name: "j"
-      language: java
-      addons:
-        apt:
-          packages:
-            - ant
-            - ant-optional
-      env:      BUILD=ICU4J
-      before_script:
-        - cd icu4j
-        - ant init
-      script:
-        - ant check
-      after_failure:
-          -  cat `find out/junit-results -name "*.txt" -exec grep -l FAILED {} \;`
-
-    - name: "c: linux gcc 8 Wextra"
-      dist:     bionic
-      language: cpp
-      addons:
-         apt:
-           packages:
-             - g++-8
-      env: PREFIX=/tmp/icu-prefix CC=gcc-8 CXX=g++-8 CXXFLAGS="-Wextra"
-      before_script:
-        - mkdir build
-        - cd build
-        - ../icu4c/source/runConfigureICU Linux --disable-debug --enable-release --disable-layoutex --prefix="${PREFIX}" || (tail -100 config.log ; false)
-        - make -j2
-      script:
-        - make -j2 check
-        - make install
-        - PATH="${PREFIX}/bin:$PATH" make -C test/hdrtst check
-
-    # gcc debug build.
-    # Includes dependency checker.
-    # Note - the dependency checker needs to be run on both a debug and an optimized build.
-    # This one (gcc) for debug, and linux clang (below) for optimized.
-    #
-    # Test both out-of-source and in-source builds. This one (gcc) for out-of-source,
-    # and linux clang (below) for in-source.
-    #
-    # Invokes test/hdrtst to check public headers compliance.
-
-    - name: "c: linux gcc (debug)"
-      dist:     xenial
-      language: cpp
-      compiler: gcc
-      env:      PREFIX=/tmp/icu-prefix
-      before_script:
-        - mkdir build
-        - cd build
-        - ../icu4c/source/runConfigureICU --enable-debug --disable-release Linux --prefix="${PREFIX}" --enable-tracing
-        - make -j2
-      script:
-        - make -j2 check
-        - ( cd ../icu4c/source/test/depstest && ./depstest.py ../../../../build/ )
-        - make install
-        - PATH="${PREFIX}/bin:$PATH" make -C test/hdrtst check
-
-    # clang release build with some options to enforce useful constraints.
-    # Includes dependency checker on an in-source, optimized build.
-    # Includes checking @draft etc. API tags vs. ifndef guards like
-    # U_HIDE_DRAFT_API and U_FORCE_HIDE_DRAFT_API.
-    # (FORCE guards make this tool pass but won't compile to working code.
-    # See the testtagsguards.sh script for details.)
-    - name: "c: linux clang"
-      dist:     xenial
-      language: cpp
-      env:
-        - CPPFLAGS="-DU_NO_DEFAULT_INCLUDE_UTF_HEADERS=1"
-        - CFLAGS="-Wimplicit-fallthrough"
-        - CXXFLAGS="-Wimplicit-fallthrough"
-      compiler: clang
-      before_install:
-        - sudo apt-get -y install doxygen  # for make dist
-      before_script:
-        - cd icu4c/source
-        - ./runConfigureICU Linux
-        - make -j2
-      script:
-        - make -j2 check
-        - ( cd test/depstest && python3 depstest.py ../../../source/ )
-        - ( cd .. && source/test/hdrtst/testtagsguards.sh )
-        - make dist # not sure if this is -j safe everywhere.
-
-    - name: "c: osx clang"
-      language: cpp
-      env:      BUILD=MACINTOSH
-      os:       osx
-      compiler: clang
-      # Use the macOS target to test Python 2 in data build script.
-      # TODO(ICU-20301): Change this back to the default Python version 3.
-      script:   cd icu4c/source && PYTHON=python2 ./runConfigureICU MacOSX && make -j2 check
-
-    # out of source gcc 8 build with c++14, runs icuinfo
-    - name: "c: linux gcc 8 c++14"
-      dist:     bionic
-      language: cpp
-      addons:
-         apt:
-           packages:
-             - g++-8
-      env: PREFIX=/tmp/icu-prefix CC=gcc-8 CXX=g++-8 CXXFLAGS="-std=c++14"
-      before_script:
-        - mkdir build && cd build
-        - ../icu4c/source/runConfigureICU Linux --disable-layout --disable-layoutex --prefix="${PREFIX}"
-        - make -j2
-      script:
-        - make -j2 check && make install
-        - cd "${PREFIX}/bin" && LD_LIBRARY_PATH=../lib ./icuinfo
-
-    # Clang Linux with address sanitizer.
-    # Note - the 'sudo: true' option forces Travis to use a Virtual machine on GCE instead of
-    #        a Container on EC2 or Packet. Asan builds of ICU fail otherwise.
-    - name: "c: linux asan (debug)"
-      language: cpp
-      env:
-        - CPPFLAGS="-fsanitize=address"
-        - LDFLAGS="-fsanitize=address"
-      os:       linux
-      dist:     xenial
-      sudo:     true
-      compiler: clang
-      before_script:
-        - cd icu4c/source
-        - ./runConfigureICU --enable-debug --disable-release Linux --disable-renaming --enable-tracing
-        - make -j2
-      script:
-        - make -j2 check
-
-
-    # Clang Linux with thread sanitizer.
-    #
-    - name: "c: linux tsan (debug)"
-      language: cpp
-      env:
-          - INTLTEST_OPTS="utility/MultithreadTest"
-          - CPPFLAGS="-fsanitize=thread"
-          - LDFLAGS=-fsanitize=thread
-      os:       linux
-      dist:     xenial
-      sudo:     true
-      compiler: clang
-      script:
-          - cd icu4c/source
-          - ./runConfigureICU --enable-debug --disable-release Linux --disable-renaming
-          - make -j2
-          - make -j2 -C test
-          - make -j2 -C test/intltest check
-
-    # copyright scan / future linter
-    - name: "lint"
-      script:
-          - perl tools/scripts/cpysearch/cpyscan.pl
-
-    - name: "j: icu4c release tools"
-      language: "java"
-      script:
-        - mvn -f tools/release/java/pom.xml package dependency:analyze
-      cache:
-        directories:
-        - $HOME/.m2
-
-    # Check compilation of internal headers.
-    - name: "internal header compilation check"
-      language: cpp
-      os:       linux
-      before_script:
-        - cd icu4c/source
-      script:
-        - test/hdrtst/testinternalheaders.sh
-
-    # Check source files for valid UTF-8 and for absence of BOM.
-    - name: "UTF-8 and BOM check"
-      os:   linux
-      script:
-        - tools/scripts/icu-file-utf8-check.py