chore(deps): update dependency ex_doc to ~> 0.30.0

[renovate]

This PR contains the following updates:

Package	Update	Change
ex_doc	minor	~> 0.29.3 -> ~> 0.30.0

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[codecov]

Codecov Report

Merging #27 (7925799) into master (c80b4a5) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #27   +/-   ##
=======================================
  Coverage   96.55%   96.55%           
=======================================
  Files           3        3           
  Lines          29       29           
=======================================
  Hits           28       28           
  Misses          1        1           

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