4.1.0

• Add support for ActiveRecord and ActionView 5.1
• Add support for Ruby 2.4
• Support calling search_for on an STI subclass, returning only records of the subclass type. (#112)
• Inherited search definitions: when defining search fields on both STI parents and subclasses, the subclass can now be searched on all fields, including those inherited from the parent. Only works for STI classes. (#135)
• Add 'tomorrow' and 'from now' keywords for searching future dates (#162)