Fix linebreak in README

Author: ffried

README.md

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 [![GitHub release](https://img.shields.io/github/release/ffried/gcdoperations.svg?style=flat)](https://github.com/ffried/GCDOperations/releases/latest)
 ![Tests](https://github.com/ffried/GCDOperations/workflows/Tests/badge.svg)
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 [![jazzy](https://raw.githubusercontent.com/ffried/GCDOperations/gh-pages/badge.svg?sanitize=true)](https://ffried.github.io/GCDOperations)
 
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 # GCDOperations
 Operations written in Swift based purely on GCD - no Objective-C dynamics, no key value observing.