Require minimum stable version, then install dev-master

Doing so prevents `wp package install` from failing when it runs a
version check

Author: danielbachhuber

.travis.yml

@@ -37,6 +37,7 @@ before_install:
   - phpenv config-rm xdebug.ini
 
 install:
+  - composer require wp-cli/wp-cli:dev-master
   - composer install
   - bash bin/install-package-tests.sh
 

circle.yml

@@ -16,6 +16,7 @@ dependencies:
     # Increase memory limit
     - echo "memory_limit = 512M" > /opt/circleci/php/$(phpenv global)/etc/conf.d/memory.ini
   override:
+    - composer require wp-cli/wp-cli:dev-master
     - composer install
     - bash bin/install-package-tests.sh
 

composer.json

@@ -21,7 +21,7 @@
         "files": [ "scaffold-package-command.php" ]
     },
     "require": {
-        "wp-cli/wp-cli": "dev-master"
+        "wp-cli/wp-cli": "^1.0.0"
     },
     "require-dev": {
         "behat/behat": "~2.5"