fix build script

Author: jaredcnance

Build.ps1

@@ -38,7 +38,7 @@ CheckLastExitCode
 dotnet test ./test/OperationsExampleTests/OperationsExampleTests.csproj
 CheckLastExitCode
 
-dotnet build .src\JsonApiDotNetCore -c Release
+dotnet build ./src/JsonApiDotNetCore/JsonApiDotNetCore.csproj -c Release
 CheckLastExitCode
 
 Write-Output "APPVEYOR_REPO_TAG: $env:APPVEYOR_REPO_TAG"