.travis.yml in pubnub-4.0.19 vs .travis.yml in pubnub-4.0.20

@@ -11,13 +11,12 @@
 
 script: bundle exec rspec
 
 matrix:
   include:
-    - rvm: 2.4.0
-    - rvm: 2.3.1
-    - rvm: 2.2.5
-    - rvm: 2.1.9
-#    - rvm: jruby-9.1.5.0
-#      env: JRUBY_OPTS="--server -J-Xms1500m -J-Xmx1500m -J-XX:+UseConcMarkSweepGC -J-XX:-UseGCOverheadLimit -J-XX:+CMSClassUnloadingEnabled"
-#      jdk: oraclejdk7
-
+    - rvm: 2.4.1
+    - rvm: 2.3.4
+    - rvm: 2.2.7
+    - rvm: 2.1.10
+    - rvm: jruby-9.1.8.0
+      env: JRUBY_OPTS="--server -J-Xms1500m -J-Xmx1500m -J-XX:+UseConcMarkSweepGC -J-XX:-UseGCOverheadLimit -J-XX:+CMSClassUnloadingEnabled"
+      jdk: oraclejdk7