.travis.yml in nest_connect-0.1.4 vs .travis.yml in nest_connect-0.1.5

@@ -1,7 +1,18 @@
----
-sudo: false
-language: ruby
 cache: bundler
+language: ruby
+install:
+  - 'gem update --system'
+  - 'gem --version'
+  - 'gem install bundler -v 1.17.2'
+  - 'bundle --version'
+  - bundle
 rvm:
-  - 2.5.1
-before_install: gem install bundler -v 1.17.1
+  - 2.4
+  - 2.5
+  - 2.6
+  - ruby-head
+os:
+  - linux
+  - osx
+notifications:
+  email: false