Update readme with new parameters

Author: Maxim Lobanov

README.md

@@ -1,11 +1,15 @@
 # setup-cocoapods
 This action sets up specific version of Cocoapods in GitHub Actions workflow.  
+Action supports two ways to specify Cocoapods version:
+- Specify particular version using `version` parameter
+- Specify path to the `Podfile.lock` file using `podfile-path` parameter. In this case, version of Cocoapods [will be parsed from Podfile.lock](https://github.com/maxim-lobanov/setup-cocoapods/blob/master/__tests__/podfile-example/Podfile.lock#L16).
 
 # Available parameters
 | Parameter      | Description                             | Supported format           |
 |---------------|-----------------------------------------|----------------------------|
 | version       | Specify version of Cocoapods to install | `latest`, `1.5.2`, `1.9.1` |
 | podfile-path  | Specify path to `Podfile.lock` file to determine Cocoapods version dynamically | `myApp/Podfile.lock` |
+
 Only one parameter `version` or `podfile-path` should be specified at the same time.
 
 # Usage