Add default replace for - to _

[mattmurch]

Also updated changelog and docs.

Resolves: #549

[mention-bot]

@mattmurch, thanks for your PR! By analyzing the history of the files in this pull request, we identified @sampsyo, @mrmachine and @geigerzaehler to be potential reviewers.

[sampsyo]

Thanks for the PR! But is #459 really what you meant to link to?

[mattmurch]

Sorry, I meant #549. I'll push a fix in a second.

[mattmurch]

Done

[mattmurch]

There is a Travis CI failure in the line I introduced in the changelog. I wrote line 55 to mimic the surrounding code, but I do not understand what it is doing. Do you know what is happening?

[sampsyo]

Aha; this is just a ReST syntax thing: the :doc: directive is for linking to other *.rst pages. We actually only really use this in the changelog for plugins, where the name of the ReST doc is the same as the name of the Python source file—here, you don't need to use a prefix. You might want to use :ref:`replace` inline in the sentence to link to the relevant config option in the configuration page, for example.

[sampsyo]

Thanks! Merged, with a slightly updated changelog entry.