Remove duplicate clean paths

Author: thenikso

lib/clean.js

@@ -36,7 +36,7 @@ module.exports = (args) => BbPromise.resolve(args).then(args => {
     Array.isArray(pkg.ecTools.clean) &&
     pkg.ecTools.clean ||
     []
-  ).map(p => path.join(process.cwd(), p))));
+  ).map(relative)));
 
   cleanDirs.forEach(pathTemplate => {
     console.log(`  Cleaning ${colors.gray(pathTemplate)}`);