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

@@ -1,5 +1,20 @@
+---
 sudo: false
+dist: trusty
 language: ruby
+
+cache: bundler
+
 rvm:
-  - 2.4.1
-before_install: gem install bundler -v 1.16.0.pre.2
+  - 2.1.10
+  - 2.2.10
+  - 2.3.7
+  - 2.4.4
+  - 2.5.1
+
+before_install:
+  - gem install bundler --no-doc
+
+script:
+  - bundle exec rspec
+  - rubocop