diff --git a/appveyor.yml b/appveyor.yml
index 1dd99ee3..085929e1 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,5 +1,5 @@
 environment:
-  nodejs_version: "9"
+  nodejs_version: "10"
 cache:
   - '%LOCALAPPDATA%\Yarn -> appveyor.yml'
   - node_modules -> yarn.lock
@@ -17,4 +17,4 @@ after_test:
       bash codecov.sh
 
 build: off
-
+skip_branch_with_pr: true
diff --git a/src/command.ts b/src/command.ts
index 786df619..d751bd27 100644
--- a/src/command.ts
+++ b/src/command.ts
@@ -81,7 +81,7 @@ export default abstract class Command {
   /**
    * actual command run code goes here
    */
-  abstract async run(): Promise<any>
+  abstract run(): PromiseLike<any>
   protected async init(): Promise<any> {
     this.debug('init version: %s argv: %o', this.ctor._base, this.argv)
     if (this.config.debug) Errors.config.debug = true