Update README.md

remove circleci

Author: NikolayS

README.md

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-[![CircleCI](https://circleci.com/gh/NikolayS/postgres_dba.svg?style=svg)](https://circleci.com/gh/NikolayS/postgres_dba)
 # postgres_dba (PostgresDBA)
-
 The missing set of useful tools for Postgres DBA and mere mortals.
 
 :warning: If you have great ideas, feel free to create a pull request or open an issue.