.travis.yml in keep_up-0.5.1 vs .travis.yml in keep_up-0.6.0

@@ -1,5 +1,18 @@
 sudo: false
 language: ruby
 rvm:
-  - 2.3.1
-before_install: gem install bundler -v 1.12.5
+  - 2.2.6
+  - 2.3.3
+  - 2.4.0
+
+before_install:
+  - rvm use @global
+  - gem uninstall bundler -x
+  - gem install bundler --version=1.13.7
+  - bundler --version
+  - git config --global user.email "[e-mail]"
+  - git config --global user.name "Your Name"
+
+branches:
+  only:
+    - master