update appveyor

Author: Courio-Dev

.appveyor.yml

@@ -39,7 +39,7 @@ init:
 
 install:
   # .NET Core SDK binaries
-  - ps: $urlCurrent = "https://download.microsoft.com/download/D/7/8/D788D3CD-44C4-487D-829B-413E914FB1C3/dotnet-sdk-2.1.300-win-x64.zip"
+  - ps: $urlCurrent = "https://download.microsoft.com/download/8/8/5/88544F33-836A-49A5-8B67-451C24709A8F/dotnet-sdk-2.1.300-win-x64.zip"
   - ps: $env:DOTNET_INSTALL_DIR = "$pwd\.dotnetsdk"
   - ps: mkdir $env:DOTNET_INSTALL_DIR -Force | Out-Null
   - ps: $tempFileCurrent = [System.IO.Path]::Combine([System.IO.Path]::GetTempPath(), [System.IO.Path]::GetRandomFileName())