Update README with a tag-filter example so it can be used during beta

README.md

@@ -7,29 +7,26 @@ This is a GitHub Action written to streamline the Ruby gem publication process.
 `GITHUB_TOKEN` - Bundler needs this to create tags on your repo for the release
 `RUBYGEMS_API_KEY` - The Rubygems API Key for an Owner of the Gem you wish to publish.  You can find your API Key by looking in `~/.gem/credentials` or using the [Rubygems API](https://guides.rubygems.org/rubygems-org-api/#misc-methods)
 
-# Env Options
+# Environment Variables
 
 `RELEASE_COMMAND` - By default, this will invoke `rake release` to build and publish the gem to Rubygems.  Set this environment variable if you have a custom release command to be invoked
 
 # Example
 
 ```hcl
 workflow "Publish Gem" {
-    on = "release"
+    on = "push"
     resolves = ["Release Gem"]
 }
 
-action "Install Dependencies" {
-  uses = "docker://ruby:2.6.0"
-  args = "bundle install"
+action "Tag Filter" {
+  uses = "actions/bin/filter@master"
+  args = "tag v*"
 }
 
 action "Release Gem" {
   uses = "cadwallion/publish-rubygems-action@master"
   secrets = ["GITHUB_TOKEN", "RUBYGEMS_API_KEY"]
-  env = {
-    "RELEASE_COMMAND" = "rake dotenv:release"
-  }
-  needs = ["Install Dependencies"]
+  needs = ["Tag Filter"]
 }
 ```