Add PHP 7.2 to travis

Author: amcsi

.travis.yml

@@ -43,6 +43,16 @@ matrix:
     - php: 7.1
       env:
         - DEPS=latest
+    - php: 7.2
+      env:
+        - DEPS=lowest
+    - php: 7.2
+      env:
+        - DEPS=locked
+    - php: 7.2
+      env:
+        - DEPS=latest
+
 
 notifications:
   email: false