.travis.yml in solidus_print_invoice-1.0.1 vs .travis.yml in solidus_print_invoice-1.0.2

- old
+ new

@@ -1,11 +1,21 @@
 sudo: false
+cache: bundler
 language: ruby
 rvm:
-  - 2.1.8
+  - 2.3.1
 env:
   matrix:
-    - SOLIDUS_BRANCH=v1.0
-    - SOLIDUS_BRANCH=v1.1
-    - SOLIDUS_BRANCH=v1.2
-    - SOLIDUS_BRANCH=v1.3
-    - SOLIDUS_BRANCH=master
+    - SOLIDUS_BRANCH=v1.0 DB=postgres
+    - SOLIDUS_BRANCH=v1.1 DB=postgres
+    - SOLIDUS_BRANCH=v1.2 DB=postgres
+    - SOLIDUS_BRANCH=v1.3 DB=postgres
+    - SOLIDUS_BRANCH=v1.4 DB=postgres
+    - SOLIDUS_BRANCH=v2.0 DB=postgres
+    - SOLIDUS_BRANCH=master DB=postgres
+    - SOLIDUS_BRANCH=v1.0 DB=mysql
+    - SOLIDUS_BRANCH=v1.1 DB=mysql
+    - SOLIDUS_BRANCH=v1.2 DB=mysql
+    - SOLIDUS_BRANCH=v1.3 DB=mysql
+    - SOLIDUS_BRANCH=v1.4 DB=mysql
+    - SOLIDUS_BRANCH=v2.0 DB=mysql
+    - SOLIDUS_BRANCH=master DB=mysql