.travis.yml in async_resource_pool-0.1.0 vs .travis.yml in async_resource_pool-0.2.0

@@ -8,16 +8,9 @@
 rvm:
   - 2.2
   - 2.3
   - 2.4
   - 2.5
-  - jruby-head
-  - ruby-head
-  - rbx-3
-matrix:
-  allow_failures:
-    - rvm: ruby-head
-    - rvm: jruby-head
-    - rvm: rbx-3
+  - 2.6
 before_install:
   - gem update --system
-  - gem install bundler -v 2.0.1
+  - gem install bundler -v 1.7.13