chore(dependencies): Bump ex_doc from 0.17.1 to 0.18.1

[dependabot-preview[bot]]

Bumps ex_doc from 0.17.1 to 0.18.1.

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[coveralls]

Coverage remained the same at 61.538% when pulling 609225dc7fd09738f8ef238b2cd331204cae5481 on dependabot/hex/ex_doc-0.18.1 into 0ccf22dca5e31b3d60913d6131111980135e3945 on develop.

[dependabot-preview[bot]]

Superseded by #13.