Update lib/_http_agent.js

Co-authored-by: Antoine du Hamel <[email protected]>

Author: pd4d10

lib/_http_agent.js

@@ -58,7 +58,7 @@ const { once } = require('internal/util');
 const {
   validateNumber,
   validateOneOf,
-  validateString
+  validateString,
 } = require('internal/validators');
 
 const kOnKeylog = Symbol('onkeylog');