Update to use the latest integration tests (#3)

* Update to use the latest integration tests

* Fixed HHVM build

Author: Nyholm

Diff for: .travis.yml

@@ -11,7 +11,6 @@ php:
     - 5.6
     - 7.0
     - 7.1
-    - hhvm
 
 env:
     global:
@@ -28,6 +27,8 @@ matrix:
     include:
         - php: 5.5
           env: COMPOSER_FLAGS="--prefer-stable --prefer-lowest" COVERAGE=true TEST_COMMAND="composer test-ci"
+        - php: hhvm
+          dist: trusty
 
 before_install:
     - if [[ $COVERAGE != true ]]; then phpenv config-rm xdebug.ini || true; fi

Diff for: composer.json

@@ -17,7 +17,7 @@
         "zendframework/zend-http": "^2.3"
     },
     "require-dev": {
-        "php-http/client-integration-tests": "^0.5.1"
+        "php-http/client-integration-tests": "^0.6"
     },
     "autoload": {
         "psr-4": {