Reverse the test order to get a coverage report of the latest features.

Author: mattacosta

.travis.yml

@@ -16,9 +16,9 @@ install:
   - gulp run-codegen
 
 script:
-  - npm test
-  - PHP_PARSER_VERSION=7_2 npm test
-  - PHP_PARSER_VERSION=7_1 npm test
   - PHP_PARSER_VERSION=7_0 npm test
+  - PHP_PARSER_VERSION=7_1 npm test
+  - PHP_PARSER_VERSION=7_2 npm test
+  - npm test
 
 after_success: npm run test:coverage