.travis.yml in database_flusher-0.1.1 vs .travis.yml in database_flusher-0.2.0

@@ -1,5 +1,17 @@
 sudo: false
 language: ruby
+cache: bundler
+
+services:
+  - mongodb
+
 rvm:
   - 2.2.4
+  - 2.3.3
+
+env:
+  - DB=sqlite3
+  - DB=mysql2
+  - DB=postgresql
+
 before_install: gem install bundler -v 1.13.3