Test with Elixir 1.7

Author: danschultzer

.travis.yml

@@ -1,19 +1,22 @@
 language: elixir
-elixir:
-  - 1.5
-  - 1.4
-otp_release:
-  - 19.0
 env:
   - MIX_ENV=test
   - UUID=resource_owners MIX_ENV=test
   - UUID=all MIX_ENV=test
 sudo: false
 matrix:
-  exclude:
+  include:
     - elixir: 1.4
+      otp_release: 19.0
+    - elixir: 1.5
+      otp_release: 19.0
+    - elixir: 1.6
+      otp_release: 20.0
+    - elixir: 1.7
+      otp_release: 20.0
       env: UUID=resource_owners MIX_ENV=test
-    - elixir: 1.4
+    - elixir: 1.7
+      otp_release: 20.0
       env: UUID=all MIX_ENV=test
 script:
   - mix deps.compile