Use dotnet-version (#16)

README.md

@@ -19,7 +19,7 @@ steps:
 - uses: actions/checkout@master
 - uses: actions/setup-dotnet@v1
   with:
-    version: '2.2.103' // SDK Version to use.
+    dotnet-version: '2.2.103' // SDK Version to use.
 - run: dotnet build <my project>
 ```
 
@@ -37,7 +37,7 @@ jobs:
       - name: Setup dotnet
         uses: actions/setup-dotnet@v1
         with:
-          version: ${{ matrix.dotnet }}
+          dotnet-version: ${{ matrix.dotnet }}
       - run: dotnet build <my project>
 ```