Bump bignum from `2cb9753` to `91c06aa`

[dependabot-preview[bot]]

Bumps bignum from 2cb9753 to 91c06aa.

Commits

• 91c06aa (chore) bump to 0.2.2
• 37f9de2 Update AssemblyScript to 0.12.3 + update other deps (#41)
• dfac457 (chore) cleanup comments
• 905c2b6 (feat) use RangeError for overflow / underflow traps
• 70e87a6 (chore) cleanups in globals
• 4b1fefc (globals) refactor __multi3 + divisions and __mulq64 / __mulh64 (#39)
• 07558bd bump to 0.2.1
• 5898c18 (feat) refactor atou128
• 4105998 (ci) remove manual installation for yarn
• 819ca10 (ci) improve travis (#38)
• Additional commits viewable in compare view

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