Add missing comma

Author: paulhuggett

.clang-tidy

@@ -60,7 +60,7 @@ CheckOptions:
   - { key: readability-identifier-naming.CheckAnonFieldInParent,          value: true       }
   - { key: readability-identifier-naming.ClassCase,                       value: lower_case }
   - { key: readability-identifier-naming.ClassConstantCase,               value: lower_case }
-  - { key: readability-identifier-naming.ClassConstantSuffix              value: _          }
+  - { key: readability-identifier-naming.ClassConstantSuffix,             value: _          }
   - { key: readability-identifier-naming.ClassMemberCase,                 value: lower_case }
   - { key: readability-identifier-naming.ClassMemberSuffix,               value: _          }
   - { key: readability-identifier-naming.ClassMethodCase,                 value: lower_case }