Travis: The Mac build log is now log-macos.txt

(oversight from f7a10a61e3bbab14d2e901c8823cec4961a46b2f)
diff --git a/.travis.yml b/.travis.yml
index 67b9585..5f6a51f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -106,7 +106,11 @@
         mv ~/src/ljt.nightly/latest/log-$TRAVIS_OS_NAME.txt ~/src/ljt.nightly/latest/files/;
       else
         ~/src/buildscripts/buildljt -d $TRAVIS_BUILD_DIR -v &&
-        mv ~/src/ljt.nightly/latest/log-$TRAVIS_OS_NAME.txt ~/src/ljt.nightly/latest/files/;
+        if [ "$TRAVIS_OS_NAME" = "osx" ]; then
+          mv ~/src/ljt.nightly/latest/log-macos.txt ~/src/ljt.nightly/latest/files/;
+        else
+          mv ~/src/ljt.nightly/latest/log-$TRAVIS_OS_NAME.txt ~/src/ljt.nightly/latest/files/;
+        fi
       fi
     fi
   - if [ "${BUILD_OFFICIAL:-}" == "" ]; then