Remove HHVM, add PHP 7.4

Author: thekid

.travis.yml

@@ -8,7 +8,7 @@ php:
   - 7.1
   - 7.2
   - 7.3
-  - hhvm
+  - 7.4
   - nightly
 
 matrix:
@@ -17,7 +17,7 @@ matrix:
     - php: nightly
 
 before_script:
-  - curl -sSL https://dl.bintray.com/xp-runners/generic/xp-run-master.sh > xp-run
+  - curl -sSL https://dl.bintray.com/xp-runners/generic/xp-run-8.1.7.sh > xp-run
   - composer install --prefer-dist
   - echo "vendor/autoload.php" > composer.pth
   - wget 'https://github.com/json-patch/json-patch-tests/archive/master.zip' -O master.zip

README.md

@@ -6,7 +6,6 @@ JSON Patch
 [![BSD Licence](https://raw.githubusercontent.com/xp-framework/web/master/static/licence-bsd.png)](https://github.com/xp-framework/core/blob/master/LICENCE.md)
 [![Required PHP 5.6+](https://raw.githubusercontent.com/xp-framework/web/master/static/php-5_6plus.png)](http://php.net/)
 [![Supports PHP 7.0+](https://raw.githubusercontent.com/xp-framework/web/master/static/php-7_0plus.png)](http://php.net/)
-[![Supports HHVM 3.5+](https://raw.githubusercontent.com/xp-framework/web/master/static/hhvm-3_5plus.png)](http://hhvm.com/)
 [![Latest Stable Version](https://poser.pugx.org/xp-forge/json-patch/version.png)](https://packagist.org/packages/xp-forge/json-patch)
 
 Implements JSON patch documents described in [RFC #6902](http://tools.ietf.org/html/rfc6902) and JSON Pointer from [RFC #6901](http://tools.ietf.org/html/rfc6901). Tested against the spec available at https://github.com/json-patch/json-patch-tests. See also http://jsonpatch.com/.