Extended the Travis config by PHP 5.6

Martin Brecht-Precht · Martin Brecht-Precht · commit 351856c5ac1c · 2018-01-03T17:41:14.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -7,6 +7,7 @@ branches:
 php:
   - '5.4'
   - '5.5'
+  - '5.6'
   - '7.0'
   - '7.1'
   - '7.2'

-Original file line number
+Diff line change
 php:
   - '5.4'
   - '5.5'
 +  - '5.6'
   - '7.0'
   - '7.1'
   - '7.2'