git-node: automatically remove temporary files (nodejs#429)

Refs: nodejs#425

Author: BridgeAR

lib/landing_session.js

@@ -255,15 +255,12 @@ class LandingSession extends Session {
       willBeLanded = `${head}...${willBeLanded}`;
     }
 
+    this.cleanFiles();
+    cli.log('Temporary files removed');
     cli.log('To finish landing:');
     cli.log(`1. Run \`git push ${upstream} ${branch}\``);
     const url = `https://github.com/${owner}/${repo}/pull/${prid}`;
     cli.log(`2. Post "Landed in ${willBeLanded}" in ${url}`);
-
-    const shouldClean = await cli.prompt('Clean up generated temporary files?');
-    if (shouldClean) {
-      this.cleanFiles();
-    }
   }
 
   async continue() {