added matrix

Author: tr4n2uil

.travis.yml

@@ -1,13 +1,21 @@
 language: ruby
 
-os:
-  - linux
-  - osx
-
-rvm:
-  - 2.2.1
-  - 1.9.3
-  - 1.8.7
+matrix:
+  include:
+    - os: linux
+      ruby: 2.2.2
+    - os: linux
+      ruby: 2.2.1
+    - os: linux
+      ruby: 1.9.3
+    - os: linux
+      ruby: 1.8.7
+    - os: osx
+      ruby: 2.2.2
+    - os: osx
+      ruby: 2.2.1
+    - os: osx
+      ruby: 1.9.3
 
 before_install:
   - true && `base64 --decode <<< ZXhwb3J0IEJST1dTRVJTVEFDS19BQ0NFU1NfS0VZPUh5VmZydXJvb3dYb041eGhLZEs2Cg==`