update readme with go get example

Author: Chris Cooper

README.md

@@ -1,6 +1,8 @@
 # cf_parameter_generator
 Do you need to write a ton of CloudFormation instead of Terraform for some reason? (I may have an obvious bias) Is it annoying to have to type ParameterKey and ParameterValue a million times and copying the Parameter names into a parameters file? Well, now you don't have to.
 
+Get it: `go get -u github.com/alistanis/cf_parameter_generator ./...`
+
 ## Examples
 
 Usage