[CLI] Fix help command (#1279)

* Bump up airline

* Since airline 0.8, "ParserUtil.createInstance" requires CommandFactory

modules/openapi-generator-cli/pom.xml

@@ -88,7 +88,7 @@
         <dependency>
             <groupId>io.airlift</groupId>
             <artifactId>airline</artifactId>
-            <version>0.7</version>
+            <version>0.8</version>
         </dependency>
         <dependency>
             <groupId>com.googlecode.lambdaj</groupId>

modules/openapi-generator-cli/src/main/java/org/openapitools/codegen/cmd/CompletionCommand.java

@@ -84,7 +84,8 @@ public class CompletionCommand
                         null,
                         null,
                         suggesterMetadata.getMetadataInjections(),
-                        bindings.build());
+                        bindings.build(),
+                        new DefaultCommandFactory<Suggester>());
 
                 return suggester.suggest();
             }