Merge pull request #5 from webimpress/php-7.2

PHP 7.2 & Prophecy 1.7

Author: malkusch

.travis.yml

@@ -8,6 +8,7 @@ cache:
 
 env:
   - PROPHECY_VERSION=dev-master
+  - PROPHECY_VERSION=~1.7.0
   - PROPHECY_VERSION=~1.6.0
   - PROPHECY_VERSION=~1.5.0
   - PROPHECY_VERSION=~1.4.0
@@ -17,6 +18,7 @@ env:
   - PROPHECY_VERSION=~1.0.0
 
 php:
+  - 7.2
   - 7.1
   - 7.0
   - 5.6