Build/Test Tools: Add PHP 7.2 to test matrix

PHP has branched 7.2 and master is now 7.3. This change ensures that 7.2 is tested. As 7.2 is still in development and is not ready for production, failures are allowed.

See #40109.


git-svn-id: https://develop.svn.wordpress.org/trunk@41175 602fd350-edb4-49c9-b593-d223f7449a82

.travis.yml

@@ -15,6 +15,7 @@ matrix:
   - php: 7.1
     env: WP_TRAVISCI=travis:js
   - php: 7.1
+  - php: 7.2
   - php: 7.0
   - php: 5.6
   - php: 5.6
@@ -29,6 +30,7 @@ matrix:
   - php: nightly
   allow_failures:
   - php: nightly
+  - php: 7.2
 before_install:
 - |
   if [[ "$WP_TRAVISCI" == "travis:phpunit" ]]; then