Drop dependency on deprecated gulp-util

[Teamop]

closes #9

[Teamop]

The Ci passed on Node 8, but it failed on Node 6 and Node 4, after I researched, this issue is related to typescript, right now, the code can just passed on TS 2.4.2, will break on the next versions, so I will just pin the TS to 2.4.2.

Issues got from the Travis CI, which related to params.spec.ts

Issues(partial)

TSError: ⨯ Unable to compile TypeScript spec/params.spec.ts (19,36): Value of type '{ (value: T): T; (): undefined; }' has no properties in common with type '{ encoding?: null | undefined; thisArg?: any; }'. Did you mean to call it? (2560) at getOutput (/home/travis/build/mcmath/gulp-transform/node_modules/ts-node/src/index.ts:307:15) at /home/travis/build/mcmath/gulp-transform/node_modules/ts-node/src/index.ts:336:16

[dex4er]

@mcmath ping?

[demurgos]

Looks good to me. Just remove @types/plugin-error.

@mcmath
Could we have this merged and published?

[demurgos]

plugin-error bundles its own types: no need for the old @types/plugin-error package.

[Teamop]

thanks @demurgos, removed

[eduardoconceicao]

@demurgos Can we get this merged?

[demurgos]

I would like to, but I am not a maintainer of this repo.

/cc @mcmath