Mention the DisallowDebugFunctionsRule in ReadMe file.

Author: rochamarcelo

README.md

@@ -133,6 +133,10 @@ Table::hasMany, Table::belongsToMany, Table::hasOne and AssociationCollection::l
 ### AddBehaviorExistsClassRule
 This rule check if the target behavior has a valid class when calling to Table::addBehavior and BehaviorRegistry::load.
 
+### DisallowDebugFunctionsRule
+This rule disallow use of debug functions (dd, debug, debug_print_backtrace, debug_zval_dump, pr, print_r, stacktrace, var_dump and var_export).
+The use of these functions in shipped code is discouraged because they can leak sensitive information or clutter output.
+
 ### DisallowEntityArrayAccessRule
 This rule disallow array access to entity in favor of object notation, is easier to detect a wrong property and to refactor code.