Upgrade rdoc to version 6.3.0

[depfu[bot]]

Here is everything you need to know about this upgrade. Please take a good look at what changed and the test results before merging this pull request.

What changed?

✳️ rdoc (~> 5.1 → ~> 6.3) · Repo · Changelog

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[coveralls]

Coverage remained the same at 49.793% when pulling ec3e45444e779541c121079d4755b1cd03adcbb2 on depfu/update/rdoc-6.3.0 into b817b7b06dc3982fb8c7a24be3c272fa02d9b4ff on master.

[depfu[bot]]

Closed in favor of #89.