message: Remove Superflous brackets around GitHub action badge
diff: VelocyPack (VPack) - a fast and compact format for serialization and storage
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  -GitHub Action: [![Build](https://github.com/arangodb/velocypack/actions/workflows/github-ci.yml/badge.svg)] Coveralls: [![Coverage Status](https://coveralls.io/repos/arangodb/velocypack/badge.svg?branch=main&service=github)](https://coveralls.io/github/arangodb/velocypack?branch=main)
  +GitHub Action: ![Build](https://github.com/arangodb/velocypack/actions/workflows/github-ci.yml/badge.svg) Coveralls: [![Coverage Status](https://coveralls.io/repos/arangodb/velocypack/badge.svg?branch=main&service=github)](https://coveralls.io/github/arangodb/velocypack?branch=main)
  Motivation
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