Fix readme - remove Core naming

Author: Per Kops

README.md

@@ -51,7 +51,7 @@ dotnet tool update --global atc-coding-rules-updater
 
 ### Usage
 
-Since the tool is published as a .NET Core Tool, it can be launched from anywhere using any shell or command-line interface by calling **atc-coding-rules-updater**. The help information is displayed when providing the `--help` argument to **atc-coding-rules-updater**
+Since the tool is published as a .NET Tool, it can be launched from anywhere using any shell or command-line interface by calling **atc-coding-rules-updater**. The help information is displayed when providing the `--help` argument to **atc-coding-rules-updater**
 
 #### Option <span style="color:yellow">--help</span>
 ```powershell