Document timeout in README.md

[hypnoglow]

Fixes #218

[codecov]

Codecov Report

Base: 42.11% // Head: 42.11% // No change to project coverage 👍

Coverage data is based on head (72c3e0c) compared to base (1c6636f).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #219   +/-   ##
=======================================
  Coverage   42.11%   42.11%           
=======================================
  Files          19       19           
  Lines         501      501           
=======================================
  Hits          211      211           
  Misses        280      280           
  Partials       10       10           

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