Update README

Author: dcodeIO

README.md

@@ -1,6 +1,6 @@
 # Set up node using nvm
 
-This action sets up a specific node.js version on GitHub Actions using nvm.
+This action sets up a specific node.js version on GitHub Actions using nvm, very similar to the original [@actions/setup-node](https://github.com/actions/setup-node). Unlike setup-node (at the time of this writing) it does support `lts/*` (latest LTS), `node` (latest stable) and custom mirrors like the one for v8-canary, but does not work on Windows.
 
 ## Inputs
 
@@ -15,13 +15,13 @@ The node.js mirror to use, e.g. `https://nodejs.org/download/v8-canary/` for can
 ## Example usage:
 
 ```yaml
-uses: dcodeIO/setup-node-nvm
+uses: dcodeIO/setup-node-nvm@master
 with:
   node-version: lts/*
 ```
 
 ```yaml
-uses: dcodeIO/setup-node-nvm
+uses: dcodeIO/setup-node-nvm@master
 with:
   node-version: node
   node-mirror: https://nodejs.org/download/v8-canary/