Add mutation from =~ and match to match?

Fixes #571

lib/mutant/mutator/node/send.rb

@@ -36,6 +36,8 @@ module Mutant
           at:            %i[fetch key?],
           fetch:         %i[key?],
           values_at:     %i[fetch_values],
+          match:         %i[match?],
+          '=~':          %i[match?],
           :[] =>         %i[at fetch key?],
           :== =>         %i[eql? equal?],
           :>= =>         %i[> == eql? equal?],

meta/send.rb

@@ -625,7 +625,7 @@ Mutant::Meta::Example.add :send do
   mutation 'self[*bar]'
 end
 
-(Mutant::AST::Types::BINARY_METHOD_OPERATORS - %i[<= >= < > == != eql?]).each do |operator|
+(Mutant::AST::Types::BINARY_METHOD_OPERATORS - %i[=~ <= >= < > == != eql?]).each do |operator|
   Mutant::Meta::Example.add :send do
     source "true #{operator} false"
 
@@ -756,6 +756,7 @@ Mutant::Meta::Example.add :send do
   mutation 'self =~ //'
   mutation '//'
   mutation 'a =~ /nomatch\A/'
+  mutation 'a.match?(//)'
 end
 
 Mutant::Meta::Example.add :send do
@@ -766,6 +767,7 @@ Mutant::Meta::Example.add :send do
   mutation '//.match'
   mutation '//.match(nil)'
   mutation '//.match(self)'
+  mutation '//.match?(a)'
   mutation '//'
   mutation '/nomatch\A/.match(a)'
 end