Require set library

[st0012]

Fixes #1752

[codecov-commenter]

Codecov Report

Merging #1753 (98f7912) into master (cf1e5b2) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1753   +/-   ##
=======================================
  Coverage   98.39%   98.39%           
=======================================
  Files         141      141           
  Lines        8046     8047    +1     
=======================================
+ Hits         7917     7918    +1     
  Misses        129      129           

Impacted Files	Coverage Δ
sentry-ruby/lib/sentry/interfaces/exception.rb	100.00% <100.00%> (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 cf1e5b2...98f7912. Read the comment docs.