Merge pull request #38 from WyriHaximus-labs/test-php-7.2-and-7.3

Test PHP 7.2 and 7.3 on Travis

Author: jsor

.travis.yml

@@ -7,6 +7,8 @@ php:
   - 5.6
   - 7.0
   - 7.1
+  - 7.2
+  - 7.3
   - hhvm # ignore errors, see below
 
 # lock distro so new future defaults will not break the build