Merge pull request #185 from apple/mark-5.4-as-release-build

Mark 'release/5.4' as being a release build

Author: abertelrud

Sources/TSCUtility/Versioning.swift

@@ -75,7 +75,7 @@ public struct Versioning {
     /// The current version of the package manager.
     public static let currentVersion = SwiftVersion(
         version: (5, 4, 0),
-        isDevelopment: true,
+        isDevelopment: false,
         buildIdentifier: getBuildIdentifier())
 
     /// The list of version specific "keys" to search when attempting to load