Use `prefer_name_location: true` in `PredicateName` rule

spec/ameba/rule/naming/predicate_name_spec.cr

@@ -21,8 +21,14 @@ module Ameba::Rule::Naming
 
     it "fails if predicate name is wrong" do
       expect_issue subject, <<-CRYSTAL
+        class Image
+          def self.is_valid?(x)
+                 # ^^^^^^^^^ error: Favour method name 'valid?' over 'is_valid?'
+          end
+        end
+
         def is_valid?(x)
-        # ^^^^^^^^^^^^^^ error: Favour method name 'valid?' over 'is_valid?'
+          # ^^^^^^^^^ error: Favour method name 'valid?' over 'is_valid?'
         end
         CRYSTAL
     end

src/ameba/rule/naming/predicate_name.cr

@@ -34,7 +34,7 @@ module Ameba::Rule::Naming
       return unless node.name =~ /^is_([a-z]\w*)\?$/
       alternative = $1
 
-      issue_for node, MSG % {alternative, node.name}
+      issue_for node, MSG % {alternative, node.name}, prefer_name_location: true
     end
   end
 end