fix: SyntaxError: Unexpected identifier

[matmorel]

Hello,

As mentioned in #350, building the docker image fails with this error:

/src/node_modules/watchify/node_modules/chokidar/index.js:162
  async remove(item) {
        ^^^^^^
SyntaxError: Unexpected identifier
    at Object.exports.runInThisContext (vm.js:76:16)
    at Module._compile (module.js:542:28)
    at Object.Module._extensions..js (module.js:579:10)
    at Module.load (module.js:487:32)
    at tryModuleLoad (module.js:446:12)
    at Function.Module._load (module.js:438:3)
    at Module.require (module.js:497:17)
    at require (internal/module.js:20:19)
    at Object.<anonymous> (/src/node_modules/watchify/index.js:3:16)
    at Module._compile (module.js:570:32)

@dazweeja provides a solution which I implemented in this PR.

[frodrigo]

Closed in favour of #383