- Adding missing language tags to markdown code blocks.
- Switching `npm` to `yarn` in README to be consistent with what repo is using locally/with travis.

Removed unneeded  and  for yarn command per code review

Also removing  from travis and appveyor yarn invocations

Fixed merge conflicts and yarn references

Removed yarn.lock and added language to code fence

Cheeky capital letter

Touched up numbering (and also switched git email account due to CLA mis-match)

feat(Page): add `setCacheEnabled(enabled)` to Page object (puppeteer#1609)

This change adds in the `Page.setCacheEnabled(enabled)` method to toggle ignoring cache for each request.

Fixes puppeteer#1556.

docs(CONTRIBUTING): update contributing.md (puppeteer#1973)