Sanitize the zone passed in.

[Blackbaud-JonathanBell]

No description provided.

[codecov-io]

Codecov Report

Merging #102 into master will increase coverage by 0.89%.
The diff coverage is 100%.

@@           Coverage Diff            @@
##           master   #102      +/-   ##
========================================
+ Coverage    99.1%   100%   +0.89%     
========================================
  Files          17     17              
  Lines         894    896       +2     
  Branches      149    150       +1     
========================================
+ Hits          886    896      +10     
+ Misses          8      0       -8

Impacted Files	Coverage Δ
src/auth/auth.ts	100% <100%> (+15.68%)	⬆️

---

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 28ac8cd...46038f3. Read the comment docs.