support child-process 0.4 and 0.5

Author: davidwdan

.travis.yml

@@ -1,14 +1,27 @@
 language: php
-sudo: required
+sudo: false
 
 php:
   - 7.0
   - 7.1
-  - hhvm
+  - 7.2
 
+## Build matrix for lowest and highest possible targets
 matrix:
-  allow_failures:
-    - php: hhvm
+  include:
+
+    - php: 7.0
+      env: dependencies=lowest
+    - php: 7.1
+      env: dependencies=lowest
+    - php: 7.2
+      env: dependencies=lowest
+    - php: 7.0
+      env: dependencies=highest
+    - php: 7.1
+      env: dependencies=highest
+    - php: 7.2
+      env: dependencies=highest
 
 install:
   - composer install

composer.json

@@ -31,7 +31,7 @@
   },
   "require": {
     "voryx/event-loop": "^3.0 || ^2.0",
-    "react/child-process": "^0.4.3",
+    "react/child-process": "^0.5 || ^0.4",
     "reactivex/rxphp": "^2.0"
   },
   "autoload-dev": {