[travis-ci] running with RG 2.6 should get the (problematic) specs green

Author: kares

.travis.yml

@@ -31,7 +31,7 @@ before_script:
   - export JRUBY_OPTS="-Xcompile.invokedynamic=false -J-XX:MaxPermSize=96M"
 before_install:
   # NOTE: RubyGems 2.4.x fails us at application_spec's gem_install_rack_unless_installed !
-  - ((jruby -v | grep -v 9.[0-9].[0-9].[0-9]) && jruby --1.9 -S gem update --system 2.2.3) || true
+  - ((jruby -v | grep -v 9.[0-9].[0-9].[0-9]) && jruby --1.9 -S gem update --system 2.6.12) || true
   - ((jruby -v | grep 1.8.7) && jruby --1.9 -S gem update --system 2.1.11) || true
   - ((echo $BUNDLE_GEMFILE | grep rails23) && jruby --1.9 -S gem update --system 1.8.29) || true
 matrix: