Place each badge on its own line for legibility

Author: asbjornu

README.md

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 A JSON-LD processor for .NET.
 
-[![NuGet][nuget-badge]][nuget] [![Build Status][travis-badge]][travis] [![codecov][codecov-badge]][codecov]
+[![NuGet][nuget-badge]][nuget]
+[![Build Status][travis-badge]][travis]
+[![codecov][codecov-badge]][codecov]
 
 This project has adopted the [Microsoft Open Source Code of Conduct][coc].
 For more information see the [Code of Conduct FAQ][coc-faq] or contact