Merge pull request #1300 from ahoppen/diagnostic-source-name

Change compiler’s diagnostic provider name to `SourceKit`

Author: ahoppen

Sources/SourceKitLSP/Swift/Diagnostic.swift

@@ -263,7 +263,7 @@ extension Diagnostic {
       severity: severity,
       code: code,
       codeDescription: codeDescription,
-      source: "sourcekitd",
+      source: "SourceKit",
       message: message,
       tags: tags,
       relatedInformation: notes,
@@ -297,7 +297,7 @@ extension Diagnostic {
       severity: diag.diagMessage.severity.lspSeverity,
       code: nil,
       codeDescription: nil,
-      source: "SwiftSyntax",
+      source: "SourceKit",
       message: diag.message,
       tags: nil,
       relatedInformation: relatedInformation,