Allow future versions of Symfony components

Pull in PHP nightly (with allowed to fail and fast finish)

Author: rquadling

.travis.yml

@@ -1,17 +1,26 @@
 language: php
 
 php:
-  - '5.4'
-  - '5.5'
-  - '5.6'
-  - '7.0'
-  - '7.1'
-  - '7.2'
+  - 5.4
+  - 5.5
+  - 5.6
+  - 7.0
+  - 7.1
+  - 7.2
+  - hhvm
+  - nightly
 
 env:
   - COMPOSER_OPTIONS="--prefer-source"
   - COMPOSER_OPTIONS="--prefer-source --prefer-lowest"
 
+matrix:
+  allow_failures:
+    - php: hhvm
+    - php: nightly
+
+fast_finish: true
+
 install:
   - git clone https://github.com/sstephenson/bats.git /tmp/bats
   - mkdir -p /tmp/local

composer.json

@@ -3,8 +3,8 @@
     "description": "Shell completion for Symfony Console based scripts",
     "license": "MIT",
     "require": {
-        "symfony/console": "^2.5|3.*",
-        "symfony/process": "^2.3|3.*",
+        "symfony/console": ">=2.5",
+        "symfony/process": ">=2.5",
         "ext-simplexml": "*"
     },
     "require-dev": {