Tag attributes which were defined to have private writer with @private
Improve documentation for `have_return_type` rspec matcher
Prevent loss of data extracted from attribute declarations with docstring
Remove non-determenism from specs of CodeObjects::AttributeWriter

Oh, I love implicit state management!
Rely on default values of AttributeWriter constructor parameters where they are not under test
Add examples with private writers to Declarations::VirtusAttribute spec
Reset YARD::Logger before all specs instead of each

Oh, have I told you already about my love of implicit state?