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…me (in Safari)

Fixes #124 (Cannot declare a parameter named 'mask' as it shadows the name of a strict mode function)

[email protected] breaks build 🚨

All methods return a promise when not passed a callback

Closes #80

feat: Add promise based api

refactor: Update dependencies to latest

js-ipfs serves a content type including the charset
`application/json; charset=utf-8` so the previous check for
json failed, resulting in non parsed json.
Fixes https://github.com/ipfs/js-ipfs/pull/69/files#r53560321

fix(request): Improve json content-type detection

Avoid calling the cb twice when statusCode > 400