update build tag for master branch

Author: gegere

README.md

@@ -1,7 +1,7 @@
 
 ## Apache Docker
 
-![Circle CI](https://circleci.com/gh/htmlgraphic/Apache/tree/develop.svg?style=svg)
+![Circle CI](https://circleci.com/gh/htmlgraphic/Apache/tree/master.svg?style=svg)
 
 This repo will give you a turn key Docker container build for use in **production** OR **dev**. The setup includes Apache/2.4.29 build, PHP 7.4+, PHP Composer, [MySQL 8.3.0](https://hub.docker.com/_/mysql) instance and a data container volume.