ICU-13005 Updated Eclipse plug-in build version.

X-SVN-Rev: 39973
diff --git a/icu4j/eclipse-build/build.properties b/icu4j/eclipse-build/build.properties
index ad2e5ed..f8cefc9 100644
--- a/icu4j/eclipse-build/build.properties
+++ b/icu4j/eclipse-build/build.properties
@@ -4,6 +4,6 @@
 #* Copyright (C) 2010-2016, International Business Machines Corporation and    *
 #* others. All Rights Reserved.                                                *
 #*******************************************************************************
-icu4j.plugin.impl.version.string=58.1.0
+icu4j.plugin.impl.version.string=59.1.0
 copyright.eclipse=(C) 2016 and later: Unicode, Inc. and others. License & terms of use: http://www.unicode.org/copyright.html#License
-icu4j.data.version.number=58
+icu4j.data.version.number=59