Update travis ruby versions

.travis.yml

@@ -5,14 +5,19 @@ language: ruby
 notifications:
  email: false
 
-before_install:
- - unset _JAVA_OPTIONS
+# Temporary disable of jruby testing. There are problems on travis-ci
+# currently with this. See:
+#
+# https://github.com/travis-ci/travis-ci/issues/9826
+#
+# before_install:
+# - unset _JAVA_OPTIONS
 
 matrix:
  include:
- - rvm: 2.1.10
- - rvm: 2.2.7
  - rvm: 2.3.4
- - rmv: 2.4.1
- - rvm: jruby-9.1.17.0
- env: JRUBY_OPTS="--dev"
+ - rvm: 2.4.1
+ - rvm: 2.5.1
+# - rvm: jruby-9.1.9.0
+# env: JRUBY_OPTS="--dev"
+# - rvm: jruby-9.2.0.0