update README (jenkinsci#488)

Author: Carroll Chiou

README.md

@@ -1,10 +1,5 @@
 # Declarative Jenkins Pipelines (Pipeline Model Definition Plugin)
 
-[![Jenkins Plugin](https://img.shields.io/jenkins/plugin/v/pipeline-model-definition)](https://plugins.jenkins.io/pipeline-model-definition)
-[![Changelog](https://img.shields.io/github/v/tag/jenkinsci/pipeline-model-definition-plugin?label=changelog)](https://github.com/jenkinsci/pipeline-model-definition-plugin/blob/master/CHANGELOG.md)
-[![Jenkins Plugin Installs](https://img.shields.io/jenkins/plugin/i/pipeline-model-definition?color=blue)](https://plugins.jenkins.io/pipeline-model-definition)
-[![Contributors](https://img.shields.io/github/contributors/jenkinsci/pipeline-model-definition-plugin.svg)](https://github.com/jenkinsci/pipeline-model-definition-plugin/contributors)
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 The Pipeline Model Definition Plugin provides a config-like syntax for defining Pipelines - thus Declarative Pipeline.
 
 ## Documentation