chore(deps): update dependency echint to v4

This PR contains the following updates:

Package	Type	Update	Change	References
echint	devDependencies	major	`^2.1.0` -> `^4.0.0`	source

Release Notes

ahmadnassri/echint

### [`v4.0.2`](https://togithub.com/ahmadnassri/echint/releases/v4.0.2) [Compare Source](https://togithub.com/ahmadnassri/echint/compare/v4.0.1...v4.0.2) ##### Bug Fixes - **dependencies:** update dependencies ([d922484](https://togithub.com/ahmadnassri/echin/commit/d922484)) - **deps:** update dependency dotenv to v6 ([e7b40c4](https://togithub.com/ahmadnassri/echin/commit/e7b40c4)) - **deps:** update dependency dotenv to v7 ([#109](https://togithub.com/ahmadnassri/echin/issues/109)) ([cd40b85](https://togithub.com/ahmadnassri/echin/commit/cd40b85)) - **deps:** update dependency lintspaces to v0.6.3 ([#100](https://togithub.com/ahmadnassri/echin/issues/100)) ([a44731e](https://togithub.com/ahmadnassri/echin/commit/a44731e)) - **package:** update chalk to version 2.0.0 ([0fe8eb5](https://togithub.com/ahmadnassri/echin/commit/0fe8eb5)) ### [`v4.0.1`](https://togithub.com/ahmadnassri/echint/releases/v4.0.1) [Compare Source](https://togithub.com/ahmadnassri/echint/compare/v4.0.0...v4.0.1) ##### Bug Fixes - **ignore:** ensure default egnore patterns are included ([7e792421](https://togithub.com/ahmadnassri/echint/commit/7e792421)) ### [`v4.0.0`](https://togithub.com/ahmadnassri/echint/releases/v4.0.0) [Compare Source](https://togithub.com/ahmadnassri/echint/compare/v3.0.0...v4.0.0) ##### Features - **core:** let linspaces handle lookup of .editorconfig files ([d31b449d](https://togithub.com/ahmadnassri/echint/commit/d31b449d), closes [#59](https://togithub.com/ahmadnassri/echint/issues/59)) ##### Breaking Changes - .editorconfig rules matching has been changed so behaviour might be different in cases where there are nested .editorconfig files in folder tree. Closes [#59](https://togithub.com/ahmadnassri/echint/issues/59) ([d31b449d](https://togithub.com/ahmadnassri/echint/commit/d31b449d)) ### [`v3.0.0`](https://togithub.com/ahmadnassri/echint/releases/v3.0.0) [Compare Source](https://togithub.com/ahmadnassri/echint/compare/v2.1.3...v3.0.0) ##### Bug Fixes - **bin:** option --ignore breaking CLI ([29013275](https://togithub.com/ahmadnassri/echint/commit/29013275)) - **test:** add node_modules to project's echint ignore ([b868ca33](https://togithub.com/ahmadnassri/echint/commit/b868ca33)) ##### Breaking Changes - ignore pattern list is not extended, the presence of one will override the previous, following this order: - Hard-coded `DEFAULT_IGNORE_PATTERNS` list. - `ECHINT_IGNORE` env var. - `echint.ignore` list inside `package.json` - `--ignore`/`-i` option(s) ([579206e0](https://togithub.com/ahmadnassri/echint/commit/579206e0))

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The build is failing

✨ Good work on this PR so far! ✨ Unfortunately, the Travis CI build is failing as of 36b66fa497a9cc9cd01fc5051cd79730fdd77b75. Here's the output:

`npm test`

> metalsmith-pug@0.0.0-development pretest /home/travis/build/ahmadnassri/metalsmith-pug
> snazzy && echint

standard: Use JavaScript Standard Style (https://standardjs.com)

/home/travis/build/ahmadnassri/metalsmith-pug/src/index.js
  54:23  error  'new Buffer()' was deprecated since v6. Use 'Buffer.alloc()' or 'Buffer.from()' (use 'https://www.npmjs.com/package/safe-buffer' for '<4.5.0') instead

/home/travis/build/ahmadnassri/metalsmith-pug/test/index.js
   22:7  error  'fs.exists' was deprecated since v4. Use 'fs.stat()' or 'fs.access()' instead
   36:7  error  'fs.exists' was deprecated since v4. Use 'fs.stat()' or 'fs.access()' instead
   67:7  error  'fs.exists' was deprecated since v4. Use 'fs.stat()' or 'fs.access()' instead
  122:7  error  'fs.exists' was deprecated since v4. Use 'fs.stat()' or 'fs.access()' instead
  143:7  error  'fs.exists' was deprecated since v4. Use 'fs.stat()' or 'fs.access()' instead

✖ 6 problems

I'm sure you can fix it! If you need help, don't hesitate to ask a maintainer of the project!

ahmadnassri / node-metalsmith-pug