fix(binpath): fix calling binaries from subdirectories

Author: zkat

index.js

@@ -115,7 +115,8 @@ function npx (argv) {
 module.exports._localBinPath = localBinPath
 function localBinPath (cwd) {
   return require('./get-prefix.js')(cwd).then(prefix => {
-    return promisify(fs.stat)('package.json').then(
+    const pkgjson = path.join(prefix, 'package.json')
+    return promisify(fs.stat)(pkgjson).then(
       () => path.join(prefix, 'node_modules', '.bin'),
       err => { if (err.code !== 'ENOENT') throw err }
     )