Add option: --ignore

[bertyhell]

Could you add an option to ignore certain folders. eg:

ep --ignore=node_modules,dist,.git

const defaultIgnores = ['.git', 'node_modules', '.yarn'];

module.exports = function each(command, args, options, callback) {
  let depth = typeof options.depth === 'undefined' ? Infinity : options.depth;
  if (depth !== Infinity) depth++; // depth is relative to first level of packages
  const ignores = options.ignore ? options.ignore.split(',') : defaultIgnores;

i tried it here, but the build failed for me:
#80

error was:

> tsds build

invalid type: unit value, expected a boolean

Process finished with exit code -1