Update branch-alias to 2.2-dev in composer.json

Author: limingxinleo

composer.json

@@ -32,7 +32,7 @@
  },
  "extra": {
  "branch-alias": {
- "dev-master": "2.1-dev"
+ "dev-master": "2.2-dev"
  },
  "hyperf": {
  "config": "Hyperf\\HttpMessage\\ConfigProvider"