Merge pull request #100 from Disper/minimal_rotation_time_docs

describes minimal-rotation-time parameter

docs/README.md

@@ -13,7 +13,9 @@ Run `make test` to see if all tests are passing.
 You can configure the Infrastructure Manager deployment with the following arguments:
 1. `gardener-kubeconfig-path` - defines the path to the Gardener project kubeconfig used during API calls
 2. `gardener-project` - the name of the Gardener project where the infrastructure operations are performed
-3. `kubeconfig-expiration-time` - maximum time after which kubeconfig is rotated. The rotation happens between `0.6 * kubeconfig-expiration-time` and `kubeconfig-expiration-time`. 
+3. `minimal-rotation-time` - the ratio determines what is the minimal time that needs to pass to rotate the certificate
+4. `kubeconfig-expiration-time` - maximum time after which kubeconfig is rotated. The rotation happens between (`minimal-rotation-time` * `kubeconfig-expiration-time`) and `kubeconfig-expiration-time`. 
+
 
 See [manager_gardener_secret_patch.yaml](../config/default/manager_gardener_secret_patch.yaml) for default values.