• Add RSpec/StringAsInstanceDoubleConstant to check for and correct strings used as instance_doubles. (@corsonknowles)
• Fix false-positive for RSpec/UnspecifiedException when a method is literally named raise_exception. (@aarestad)
• Fix false-positive for RSpec/UnspecifiedException when not_to raise_error is used within a block. (@aarestad, @G-Rath)