fixed typo.

Author: HugoMario

modules/swagger-codegen/src/main/java/io/swagger/codegen/v3/templates/HandlebarTemplateEngine.java

@@ -26,7 +26,7 @@ public String getRendered(String templateFile, Map<String, Object> templateData)
     }
 
     @Override
-    public String gerName() {
+    public String getName() {
         return CodegenConstants.HANDLEBARS_TEMPLATE_ENGINE;
     }
 

modules/swagger-codegen/src/main/java/io/swagger/codegen/v3/templates/MustacheTemplateEngine.java

@@ -46,7 +46,7 @@ public String getRendered(String templateFile, Map<String, Object> templateData)
     }
 
     @Override
-    public String gerName() {
+    public String getName() {
         return CodegenConstants.MUSTACHE_TEMPLATE_ENGINE;
     }
 

modules/swagger-codegen/src/main/java/io/swagger/codegen/v3/templates/TemplateEngine.java

@@ -7,5 +7,5 @@ public interface TemplateEngine {
 
     String getRendered(String templateFile, Map<String, Object> templateData) throws IOException;
 
-    String gerName();
+    String getName();
 }