Fix a space in the documentation (#248)

Author: PureKrome

README.md

@@ -36,7 +36,7 @@ Multiple versions:
 steps:
 - name: Setup dotnet
 - uses: actions/checkout@v2
--  uses: actions/setup-dotnet@v1
+- uses: actions/setup-dotnet@v1
   with:
     dotnet-version: | 
       3.1.x