Update README.md

Removing WIP message from README

Author: mboudreau

README.md

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-# Atlassian Connect example app - Node edition
-
-> **_NOTE:_**  This repository is in progress and is not ready yet.
+# Atlassian Connect Node Example App
 
 ## About
 This repository contains an example [Express](https://expressjs.com/en/4x/api.html) server for building an [Atlassian Connect app](https://developer.atlassian.com/cloud/jira/platform/getting-started-with-connect/).