.travis.yml in memoist-0.15.0 vs .travis.yml in memoist-0.16.0

- old
+ new

@@ -4,14 +4,19 @@
 rvm:
   - 1.8.7
   - 1.9.2
   - 1.9.3
   - 2.0.0
-  - 2.1.0
-  - 2.2.0
-  - 2.3.0
+  - 2.1.10
+  - 2.2.7
+  - 2.3.4
+  - 2.4.1
+  - ruby-head
   - jruby-18mode
   - jruby-19mode
-  - rbx-2
-  - ruby-head
+  - jruby-9.1.5.0
   - jruby-head
-  - ree
+
+before_install:
+  - gem install bundler --no-document -v '~> 1.13'
+before_script:
+  - unset JRUBY_OPTS