Add mutation from {is_a,kind_of}? to instance_of?

lib/mutant/mutator/node/send.rb

@@ -12,6 +12,8 @@ module Mutant
 
         SELECTOR_REPLACEMENTS = IceNine.deep_freeze(
           reverse_map:  [:map, :each],
+          kind_of?:     [:instance_of?],
+          is_a?:        [:instance_of?],
           reverse_each: [:each],
           map:          [:each],
           send:         [:public_send],

meta/send.rb

@@ -63,6 +63,32 @@ Mutant::Meta::Example.add do
   mutation 'foo.equal?(bar)'
 end
 
+Mutant::Meta::Example.add do
+  source 'foo.is_a?(bar)'
+
+  singleton_mutations
+  mutation 'foo'
+  mutation 'bar'
+  mutation 'foo.is_a?'
+  mutation 'foo.is_a?(nil)'
+  mutation 'foo.is_a?(self)'
+  mutation 'self.is_a?(bar)'
+  mutation 'foo.instance_of?(bar)'
+end
+
+Mutant::Meta::Example.add do
+  source 'foo.kind_of?(bar)'
+
+  singleton_mutations
+  mutation 'foo'
+  mutation 'bar'
+  mutation 'foo.kind_of?'
+  mutation 'foo.kind_of?(nil)'
+  mutation 'foo.kind_of?(self)'
+  mutation 'self.kind_of?(bar)'
+  mutation 'foo.instance_of?(bar)'
+end
+
 Mutant::Meta::Example.add do
   source 'foo.gsub(a, b)'