Fixup: Casing

Casing fix

Co-authored-by: Andy Jordan <[email protected]>

Author: JustinGrote

README.md

@@ -175,7 +175,7 @@ Install-Module InvokeBuild -Scope CurrentUser
 Install-Module platyPS -Scope CurrentUser
 ```
 
-### 4. Adjust `Nuget.Config` if necessary
+### 4. Adjust `nuget.config` if necessary
 
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