Reports also methods not ending with ? suffix in PredicateName rule

spec/ameba/rule/naming/predicate_name_spec.cr

@@ -30,6 +30,10 @@ module Ameba::Rule::Naming
         def is_valid?(x)
           # ^^^^^^^^^ error: Favour method name 'valid?' over 'is_valid?'
         end
+
+        def is_valid(x)
+          # ^^^^^^^^ error: Favour method name 'valid?' over 'is_valid'
+        end
         CRYSTAL
     end
 

src/ameba/rule/naming/predicate_name.cr

@@ -31,7 +31,7 @@ module Ameba::Rule::Naming
     MSG = "Favour method name '%s?' over '%s'"
 
     def test(source, node : Crystal::Def)
-      return unless node.name =~ /^is_([a-z]\w*)\?$/
+      return unless node.name =~ /^is_([a-z]\w*)\??$/
       alternative = $1
 
       issue_for node, MSG % {alternative, node.name}, prefer_name_location: true