fixed import and group id on meta generator template.

Author: HugoMario

src/main/resources/v2/codegen/generatorClass.mustache

@@ -1,6 +1,6 @@
 package {{generatorPackage}};
 
-import io.swagger.codegen.*;
+import io.swagger.codegen.v3.*;
 import io.swagger.codegen.v3.generators.DefaultCodegenConfig;
 
 import java.util.*;

src/main/resources/v2/codegen/pom.mustache

@@ -106,13 +106,13 @@
     </build>
     <dependencies>
         <dependency>
-            <groupId>io.swagger</groupId>
+            <groupId>io.swagger.codegen.v3</groupId>
             <artifactId>swagger-codegen</artifactId>
             <version>${swagger-codegen-version}</version>
             <scope>provided</scope>
         </dependency>
         <dependency>
-            <groupId>io.swagger</groupId>
+            <groupId>io.swagger.codegen.v3</groupId>
             <artifactId>swagger-codegen-generators</artifactId>
             <version>${swagger-codegen-generators-version}</version>
             <scope>provided</scope>