fix(FormBot): Remove validation chaining for async validations

[schlegz]

Fixes an issue in some browsers that do not support chaining finally.

Asana: https://app.asana.com/0/1127722639002160/1136619333118829/f

[codecov]

Codecov Report

Merging #65 into master will increase coverage by 0.14%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master      #65      +/-   ##
==========================================
+ Coverage   66.29%   66.44%   +0.14%     
==========================================
  Files          22       22              
  Lines         451      450       -1     
  Branches       91       91              
==========================================
  Hits          299      299              
+ Misses        123      122       -1     
  Partials       29       29

Impacted Files	Coverage Δ
src/Form/Formbot.js	2.77% <0%> (+0.03%)	⬆️

---

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 926c60a...347c3cd. Read the comment docs.

[cehsu]

Looks good, but doesn't seem to behave as expected when QAing, will keep looking.