Update README.md

Author: usercode

README.md

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 # ImageWizard
-A ASP.NET Core service / middleware to resize your images dynamically as alternative for thumbor.
+A ASP.NET Core service / middleware to resize your images on the fly as alternative for thumbor.
 
 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg?style=flat-square)](https://opensource.org/licenses/MIT)
 [![NuGet](https://img.shields.io/nuget/v/ImageWizard.Core.svg?style=flat-square)](https://www.nuget.org/packages/ImageWizard.Core/)