fix checkout

Author: isc30

.github/workflows/build-all.yml

@@ -1,4 +1,4 @@
-name: .NET Core (Ubuntu)
+name: Build all
 
 on: [push]
 
@@ -13,7 +13,7 @@ jobs:
 
     steps:
     - name: Checkout the repository
-      uses: actions/checkout@v2
+      uses: actions/checkout@v1
 
     - name: Setup .NET Core
       uses: actions/setup-dotnet@v1

.github/workflows/master.yml renamed to .github/workflows/nuget-publish.yml

@@ -1,4 +1,4 @@
-name: Build all (master)
+name: Nuget publish
 
 on:
   release: