Update index.d.ts

[brandonros]

Fixes #76 (maybe)

[codecov]

Codecov Report

Merging #77 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master    #77   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           4      4           
  Lines         174    174           
=====================================
  Hits          174    174

---

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 48e01a4...94ad46d. Read the comment docs.

[codecov]

Codecov Report

Merging #77 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master    #77   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           4      4           
  Lines         174    174           
=====================================
  Hits          174    174

---

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 48e01a4...94ad46d. Read the comment docs.

[whxaxes]

Can you add an unittest case for this?

[fengmk2]

#87