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Port 2021 04 18

See merge request dms3/public/go-cid!1

Bumps [github.com/multiformats/go-varint](https://github.com/multiformats/go-varint) from 0.0.5 to 0.0.6.
- [Release notes](https://github.com/multiformats/go-varint/releases)
- [Commits](https://github.com/multiformats/go-varint/compare/v0.0.5...v0.0.6)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [github.com/multiformats/go-multihash](https://github.com/multiformats/go-multihash) from 0.0.13 to 0.0.14.
- [Release notes](https://github.com/multiformats/go-multihash/releases)
- [Commits](https://github.com/multiformats/go-multihash/compare/v0.0.13...v0.0.14)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

This fixes the comment to be consistent with the code, and fixes spelling.

Fixes Issue #111

> ./cid_test.go:451:52: conversion from uint64 to string yields a string of one rune, not a string of digits (did you mean fmt.Sprint(x)?)

feat: optimize cid.Prefix

We call this frequently and having to allocate here is really unfortunate.

Chore/base36 support

Base36 was introduced mainly for use in DNS, and various user agents
force lowercase, so tests should use that instead.

License: MIT
Signed-off-by: Marcin Rataj <lidel@lidel.org>

feat: add Filecoin multicodecs

* fil-commitment-unsealed
* fil-commitment-sealed

Ref: https://github.com/multiformats/multicodec/pull/161
Ref: https://github.com/multiformats/multicodec/pull/172

avoid calling the method WriteTo if we don't satisfy its contract

add a couple useful methods

chore: make comment reflect the code

During the change to default CIDV1 to Base32, the corresponding code
comment wasn't updated.

fix: enforce minimal encoding

Note: this removes two errors that don't appear to be used by anyone.

docs(readme): remove reference to gx

Bump github.com/multiformats/go-multihash from 0.0.9 to 0.0.10