chore: update log text

Author: zdm

lib/package.js

@@ -1118,7 +1118,7 @@ export default class Package {
         if ( !res.ok ) return res;
 
         // package is dirty
-        if ( res.data.isDirty ) return result( [ 500, "Package has uncommited changes" ] );
+        if ( res.data.isDirty ) return result( [ 500, "Work tree has uncommited changes" ] );
 
         const upstream = this.git.upstream,
             packages = [ this, ...this.subPackages ],