.travis.yml in lifx_dash-0.3.1 vs .travis.yml in lifx_dash-0.4.0

@@ -1,18 +1,15 @@
 sudo: required
 language: ruby
 rvm:
-  - 2.1.10
-  - 2.2.9
-  - 2.3.6
-  - 2.4.3
-  - 2.5.1
+  - 2.3.8
+  - 2.4.6
+  - 2.5.5
+  - 2.6.3
   - ruby-head
 
 before_install:
   - sudo apt-get install libpcap-dev -qq
-  - gem update --system
-  - gem install bundler
 
 matrix:
   allow_failures:
   - rvm: ruby-head