chore(deps): update dependency cz-conventional-changelog to v2

This PR contains the following updates:

Package	Type	Update	Change	References
cz-conventional-changelog	devDependencies	major	`^1.2.0` -> `^2.0.0`	source

Release Notes

commitizen/cz-conventional-changelog

### [`v2.1.0`](https://togithub.com/commitizen/cz-conventional-changelog/releases/v2.1.0) [Compare Source](https://togithub.com/commitizen/cz-conventional-changelog/compare/v2.0.0...v2.1.0) <a name"2.1.0"> #### 2.1.0 (2017-10-27) ##### Features - **prompt:** add confirmation fields + edit for clarity ([#58](https://togithub.com/commitizen/cz-conventional-changelog/issues/58)) ([d40ac2c5](https://togithub.com/commitizen/cz-conventional-changelog/commit/d40ac2c5)) ### [`v2.0.0`](https://togithub.com/commitizen/cz-conventional-changelog/releases/v2.0.0) [Compare Source](https://togithub.com/commitizen/cz-conventional-changelog/compare/v1.2.0...v2.0.0) <a name"2.0.0"> #### 2.0.0 (2017-02-21) ##### Features - **adapter:** Split breaking changes into separate question ([#44](https://togithub.com/commitizen/cz-conventional-changelog/issues/44)) ([2d78e1d4](https://togithub.com/commitizen/cz-conventional-changelog/commit/2d78e1d4), closes [#17](https://togithub.com/commitizen/cz-conventional-changelog/issues/17)) ##### Breaking Changes - Breaking changes now automatically include the "BREAKING CHANGE: " prefix. closes [#17](https://togithub.com/commitizen/cz-conventional-changelog/issues/17) ([2d78e1d4](https://togithub.com/commitizen/cz-conventional-changelog/commit/2d78e1d4))

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The build is failing

✨ Good work on this PR so far! ✨ Unfortunately, the Travis CI build is failing as of 90f8983d22b893b5924d4978d529b1c7986ed43f. 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