Add SwiftLint HARD rules

Sources/ResgenSwift/Generate/GenerateError.swift

@@ -8,26 +8,26 @@
 import Foundation
 
 enum GenerateError: Error {
+
     case fileNotExists(String)
     case invalidConfigurationFile(String, String)
     case commandError([String], String)
     case writeFile(String, String)
-    
+
     var description: String {
         switch self {
         case .fileNotExists(let filename):
             return "error: [\(Generate.toolName)] File \(filename) does not exists"
-    
-        case .invalidConfigurationFile(let filename, let underneathErrorDescription):
+
+        case let .invalidConfigurationFile(filename, underneathErrorDescription):
             return "error: [\(Generate.toolName)] File \(filename) is not a valid configuration file. Underneath error: \(underneathErrorDescription)"
-            
-        case .commandError(let command, let terminationStatus):
+
+        case let .commandError(command, terminationStatus):
             let readableCommand = command
-                .map { $0 }
                 .joined(separator: " ")
             return "error: [\(Generate.toolName)] An error occured while running command '\(readableCommand)'. Command terminate with status code: \(terminationStatus)"
-            
-        case .writeFile(let filename, let info):
+
+        case let .writeFile(filename, info):
             return "error: [\(Generate.toolName)] An error occured while writing file in \(filename): \(info)"
         }
     }