Update README with improved usage examples

Author: Ira W. Snyder

README.md

@@ -18,7 +18,7 @@ jobs:
   puppet-parser-validate:
 
     runs-on: ubuntu-latest
-    
+
     steps:
     - name: Checkout
       uses: actions/checkout@v2
@@ -29,6 +29,31 @@ jobs:
         args: ./
 ```
 
+If you wish to use a specific version, without needing to rebuild the container
+each time, you can use the version hosted on the [Docker Hub](https://hub.docker.com/r/irasnyd/puppet-parser-validate-action).
+
+For example:
+
+```yaml
+name: Puppet Parser Validate
+
+on: [push]
+
+jobs:
+  puppet-parser-validate:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+
+    - name: puppet-parser-validate
+      uses: docker://irasnyd/puppet-parser-validate-action:5.5.19
+      with:
+        args: ./
+```
+
 ## License
 
 The [Dockerfile](Dockerfile) and associated scripts and documentation in this