refactor: remove unused function

[hyanmandian]

I'm just removing a function that is no longer called.

[codecov-commenter]

Codecov Report

Merging #15 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #15   +/-   ##
=======================================
  Coverage   89.16%   89.16%           
=======================================
  Files           3        3           
  Lines         277      277           
=======================================
  Hits          247      247           
  Misses         30       30           

Impacted Files	Coverage Δ
src/assert.js	90.27% <ø> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 987a3f5...0306273. Read the comment docs.

[lukeed]

Oops, thanks