Fix auto-correction `RedundantBegin` cop

Auto-correction of `Style/RedundantBegin` cop have treated new line as
indentation and deleted them.

Fix #1307.
Make PredicateName more flexible

It can now report offense for a name like `has_something` without
necessary suggesting the name `something?`.
Merge pull request #1308 from yous/patch-redundant-begin

Fix auto-correction `RedundantBegin` cop
Fix changelog entry
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