Merge pull request #318 from beryllium/patch-1

Update travis-ci configuration to test in PHP7.3/4

Author: michelf

.travis.yml

@@ -7,13 +7,16 @@ cache:
     - $HOME/.composer/
 
 # Run tests against all these PHP versions
+# TODO: When it becomes possible in TravisCI, switch 7.4snapshot to plain 7.4
 php:
   - 5.4
   - 5.5
   - 5.6
   - 7.0
   - 7.1
   - 7.2
+  - 7.3
+  - 7.4snapshot
   - hhvm
 
 before_script: