Semver-major release: 5.0.0

[fanatid]

First, @indutny @calvinmetcalf thanks for trust and allowance to maintain this project. And sorry for delay.

Initially, I planned fill CHANGELOG.md and submit PR with minor version, but almost immediately I remembered that master branch already have semver-major changes which was never published. So I decide:

1. Summarize all current changes, submit PR with CHANGELOG for semver-major version: 5.0.0
2. Merge/update/close current not semver-major PR's and release semver-minor version: 5.1.0 and so on..
3. Start work on unfinished semver-major changes from Breaking changes for the next major release #129 for version: 6.0.0

I'm not sure that I'll able finish 6.0.0, but I'll try do this.

5.0.0 can be considered as intermediate version. It's fastest way receive bn.js with patches from ~2 last years.

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@indutny @calvinmetcalf I'd prefer not release version 5.0.0 without ACK. Are you ok with this plan?
No need merge this PR, this mostly preview. If you agree with proposed process, I'll commit changes directly to master.

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• travis: update node versions (Update .travis.yml #205)
• Refactor buffer constructor (new Buffer is deprecated and unsafe #200)
• lib: fix for negative numbers: imuln, modrn, idivn (lib: fix for negative numbers: imuln, modrn, idivn #185)
• bn: fix Red#imod (bn: fix Red#imod #178)
• check unexpected high bits for invalid characters (check unexpected high bits for invalid characters #173)
• document support very large integers (Do you support very large integers (256 bit)? #158)
• only define toBuffer if Buffer is defined (only define toBuffer if Buffer is defined #172)
• lib: better validation of string input (BN parses invalid characters #151)
• tests: reject decimal input in constructor (Reject decimal input #91)
• bn: make .strip() an internal method (readme: document strip() and toJSON() #105)
• lib: deprecate .modn() introduce .modrn() (modn API inconsistency #112 Breaking changes for the next major release #129 bn: make .modn() return a BN (fixes #112) #130)
• bn: don't accept invalid characters (Don't accept invalid characters #141)
• package: use files insteadof .npmignore (Add section files to package.json #152)
• bn: improve allocation speed for buffers (bn: improve allocation speed for buffers. avoid deprecation warning. #167)
• toJSON to default to interoperable hex (length % 2) (toJSON to default to interoperable hex (length % 2) #164)

[axic]

Can some other renames make it into the release to make the API more consistent?

[fanatid]

Do you mean andln => andrn? I think yes, this should be simple change.

[indutny]

👍

[fanatid]

Published v5.0.0 (8a8d9ba)