Fix typo on src/index on warn message

[acewf]

• warn message warnmsg was refering to asyncBootsrap instead of asyncBootstrap

[codecov]

Codecov Report

Merging #11 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #11   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           1      1           
  Lines           7      7           
  Branches        2      2           
=====================================
  Hits            7      7

Impacted Files	Coverage Δ
src/index.js	100% <100%> (ø)	⬆️

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