update gitpod badge URL due to referrer issues

gitpod-io/gitpod#688

Author: jywarren

README.md

@@ -4,7 +4,7 @@ Image Sequencer
 [![Code of Conduct](https://img.shields.io/badge/code-of%20conduct-green.svg)](https://publiclab.org/conduct)
 [![npm version](https://badge.fury.io/js/image-sequencer.svg)](https://badge.fury.io/js/image-sequencer)
 [![Build Status](https://travis-ci.org/publiclab/image-sequencer.svg?branch=master)](https://travis-ci.org/publiclab/image-sequencer) [![Maintainability](https://api.codeclimate.com/v1/badges/5906996dd2e90aca6398/maintainability)](https://codeclimate.com/github/publiclab/image-sequencer/maintainability) [![Codecov](https://img.shields.io/codecov/c/github/publiclab/image-sequencer.svg?logo=codecov)](https://codecov.io/gh/publiclab/image-sequencer)
-[![Gitpod Ready-to-Code](https://img.shields.io/badge/Gitpod-ready--to--code-blue?logo=gitpod)](https://gitpod.io/from-referrer/)
+[![Gitpod Ready-to-Code](https://img.shields.io/badge/Gitpod-ready--to--code-blue?logo=gitpod)](https://gitpod.io/#https://github.com/publiclab/image-sequencer/)
 
 - **Latest Stable Demo**: https://sequencer.publiclab.org
 - **Latest Beta Demo**: https://beta.sequencer.publiclab.org