Take 2

Author: Nick Craver

appveyor.yml

@@ -71,9 +71,8 @@ build_script:
 - ps: >-
     if ($env:OS -eq "Windows_NT") {
       .\build\dotnet-install.ps1 -Version 2.1.400
-    } else {
-      ./build/dotnet-install.sh --version 2.1.400
     }
+- sh: ./build/dotnet-install.sh --version 2.1.400
 - ps: .\build.ps1 -PullRequestNumber "$env:APPVEYOR_PULL_REQUEST_NUMBER" -CreatePackages ($env:OS -eq "Windows_NT")
 
 test: off