Update README.md

Author: mcustiel

README.md

@@ -12,15 +12,15 @@ Codeception extension to make working with [Phiremock Server](https://github.com
 
 ```json
     "require-dev": {
-        "mcustiel/phiremock-codeception-extension": "v2.0"
+        "mcustiel/phiremock-codeception-extension": "^2.0"
     }
 ```
 
 Optionally, you can install Phiremock Server in case you want to have it between your dependencies. If not, you need to specify the path to phiremock in the configuration.
 
 ```json
 "require-dev": {
-    "mcustiel/phiremock-codeception-extension": "v2.0",
+    "mcustiel/phiremock-codeception-extension": "^2.0",
     "mcustiel/phiremock-server": "^1.0",
     "guzzlehttp/guzzle": "^6.0"
 ```