#329 Bump ex_doc from 0.22.1 to 0.22.6

1 untracked files changed.
Other files ignored by Codecov
mix.lock has changed.

No tracked files changed.

Everything is accounted for!

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What changes does Codecov check for?
Lines, not adjusted in diff, that have changed coverage data.
Files that introduced coverage data that had none before.
Files that have missing coverage data that once were tracked.
Files Coverage
lib/xgit 100.00%
Project Totals (32 files) 100.00%