Merge pull request #121 from wp-cli/lock-framework-version-to-220

Lock framework version to ^2.2

Author: schlessera

composer.json

@@ -13,7 +13,7 @@
     ],
     "require": {
         "composer/semver": "^1.4",
-        "wp-cli/wp-cli": "dev-master as v2.2.0"
+        "wp-cli/wp-cli": "^2.2"
     },
     "require-dev": {
         "wp-cli/checksum-command": "^1 || ^2",