Bump bl from 1.2.1 to 2.2.1

[dependabot[bot]]

Bumps bl from 1.2.1 to 2.2.1.

Release notes

Sourced from bl's releases.

v2.2.1

Fix unintialized memory access

v2.2.0

• Add indexOf docs #60
• fix empty shallowSlice return #65

v2.1.2

• use ES3 only #62

v2.1.1

• Use native indexOf whenever possible #61

v2.1.0

• Added indexOf #59

v2.0.1

• Use require('readable-stream').Duplex #56

v2.0.0

• Added support for readUIntLE and companions #55

v1.2.2

• use safe-buffer #51

Commits

• 8cb93f4 Bumped v2.2.1
• dacc4ac Fix unintialized memory access
• b6284a8 Bumped v2.2.0.
• 538a988 Merge pull request #60 from reconbot/reconbot/indexof-readme
• 635b6ce Merge pull request #65 from reconbot/reconbot/empty-slice
• 9b80b00 fix: empty shallowSlice return
• 055a3ff Merge pull request #63 from nwoltman/patch-1
• c768eb8 Use Buffer.from() in the documentation
• 270e5f5 Bumped v2.1.2
• 91cbaf9 Merge pull request #62 from jhaenchen/DontUseES2015Const
• Additional commits viewable in compare view

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