Release-Checklist.md

@@ -42,6 +42,7 @@ Check status of the tag build on travis CI.
 
 Tests:
 
+What to check:
 * Check DockerHub: 
   -  https://hub.docker.com/r/openapitools/openapi-generator-cli/tags/
   -  https://hub.docker.com/r/openapitools/openapi-generator-online/tags/
@@ -49,6 +50,23 @@ Tests:
   -  Run a small maven project using the `openapi-generator-maven-plugin` central plugin
   -  Run a small gradle project: `modules/openapi-generator-gradle-plugin/samples/local-spec`, according to the `README.md` there, do some test with `-PopenApiGeneratorVersion=<version>`
 
+How to check:
+- run `ruby ./bin/utils/release_checkout.rb 3.1.0` (example) and the result looks like the following:
+```
+Running checkout on OpenAPI Generator release 3.1.0
+Checking homebrew forumla ... [OK]
+Checking openapi-generator JAR ... [OK]
+Checking openapi-generator-cli JAR ... [OK]
+Checking openapi-generator-maven-plugin JAR ... [OK]
+Checking openapi-generator-gradle-plugin JAR ... [OK]
+Checking openapi-generator-online JAR ... [OK]
+Checking openapi-generator-project pom.xml ... [OK]
+Checking openapi-generator README.md ... [OK]
+Checking openapi-generator-online docker ... [OK]
+Checking openapi-generator-cli docker ... [OK]
+```
+
+(Note: the release checkout script may not catch every possible edge cases and will need further enhancement to take care of those situations)
 
 ## After Release