Add Solidus 2.7 to .travis.yml

Author: jacob

.travis.yml

@@ -22,6 +22,7 @@ env:
     - SOLIDUS_BRANCH=v2.4 DB=postgres
     - SOLIDUS_BRANCH=v2.5 DB=postgres
     - SOLIDUS_BRANCH=v2.6 DB=postgres
+    - SOLIDUS_BRANCH=v2.7 DB=postgres
     - SOLIDUS_BRANCH=master DB=postgres
     - SOLIDUS_BRANCH=v1.1 DB=mysql
     - SOLIDUS_BRANCH=v1.2 DB=mysql
@@ -34,4 +35,5 @@ env:
     - SOLIDUS_BRANCH=v2.4 DB=mysql
     - SOLIDUS_BRANCH=v2.5 DB=mysql
     - SOLIDUS_BRANCH=v2.6 DB=mysql
+    - SOLIDUS_BRANCH=v2.7 DB=mysql
     - SOLIDUS_BRANCH=master DB=mysql