Not working with Rails 6

[AquisTech]

Not working with Rails 6 and possibly may not work with Rails 5

ArgumentError (Passing string to be evaluated in :if and :unless conditional options is not supported. Pass a symbol for an instance method, or a lambda, proc or block, instead.):
  
(eval):15:in `define_methods_for'

Full trace

(eval):15:in `define_methods_for'
/home/anand/projects/has_contact_number/lib/has_contact_number/model_methods.rb:16:in `class_eval'
/home/anand/projects/has_contact_number/lib/has_contact_number/model_methods.rb:16:in `define_methods_for'
/home/anand/projects/has_contact_number/lib/has_contact_number/model_methods.rb:10:in `block in contact_number_attributes'
/home/anand/projects/has_contact_number/lib/has_contact_number/model_methods.rb:8:in `each'
/home/anand/projects/has_contact_number/lib/has_contact_number/model_methods.rb:8:in `contact_number_attributes'

[AquisTech]

Fixed with PR#2