add note to deprecate swift generator

Author: wing328

modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/AbstractCSharpCodegen.java

@@ -47,6 +47,8 @@ public abstract class AbstractCSharpCodegen extends DefaultCodegen implements Co
     public AbstractCSharpCodegen() {
         super();
 
+        supportsInheritance = true;
+
         // C# does not use import mapping
         importMapping.clear();
 

modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/SwiftCodegen.java

@@ -23,6 +23,11 @@
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
+/**
+ * Swift (2.x) generator is no longer actively maintained. Please use 
+ * 'swift3' or 'swift4' generator instead.
+ */
+
 public class SwiftCodegen extends DefaultCodegen implements CodegenConfig {
     public static final String PROJECT_NAME = "projectName";
     public static final String RESPONSE_AS = "responseAs";
@@ -61,7 +66,7 @@ public String getName() {
 
     @Override
     public String getHelp() {
-        return "Generates a swift client library.";
+        return "Generates a Swift (2.x) client library. IMPORTANT NOTE: this generator (swfit 2.x)  is no longer actively maintained so please use 'swift3' or 'swift4' generator instead.";
     }
 
     public SwiftCodegen() {