Update testing environment.

.travis.yml

@@ -11,11 +11,11 @@ branches:
   - dev
   - "/^(0|[1-9]\\d*)\\.(0|[1-9]\\d*)\\.(0|[1-9]\\d*)(-(0|[1-9]\\d*|\\d*[a-zA-Z-][0-9a-zA-Z-]*)(\\.(0|[1-9]\\d*|\\d*[a-zA-Z-][0-9a-zA-Z-]*))*)?(\\+[0-9a-zA-Z-]+(\\.[0-9a-zA-Z-]+)*)?$/"
 php:
-- 7.1
 - 7.0
+- 7.1
+- 7.2
 - nightly
 env:
-- TRAVIS_NODE_VERSION="6"
 - TRAVIS_NODE_VERSION="8"
 matrix:
   allow_failures: