fix small mistake (#14)

fix small mistake

Author: unixfox

index.js

@@ -39,7 +39,7 @@ function checkFileExist(path, exit) {
  return (true);
  else
  if (exit) {
- console.error("The file " + file + " doesn't exist, can't continue. Please check the documentation for further details.");
+ console.error("The file " + path + " doesn't exist, can't continue. Please check the documentation for further details.");
  process.exit(1);
  }
  else