diff --git a/lib/options.js b/lib/options.js
index <HASH>..<HASH> 100644
--- a/lib/options.js
+++ b/lib/options.js
@@ -33,21 +33,14 @@ module.exports.parse = function (argv) {
       // Deprecated in 0.0.10
       'flow-parser'
     ],
-    string: ['print-width', 'tab-width', 'parser', 'trailing-comma'],
+    string: ['parser', 'trailing-comma'],
     default: {
       semi: true,
       color: true,
       'bracket-spacing': true,
       parser: 'babylon'
     },
-    alias: { help: 'h', version: 'v', 'list-different': 'l' },
-    unknown: function (param) {
-      if (param.startsWith('-')) {
-        console.warn('Ignored unknown option: ' + param + '\n');
-        return false;
-      }
-      return true;
-    }
+    alias: { help: 'h', version: 'v', 'list-different': 'l' }
   });
   return camelcaseKeys(parsed);
 };
Relax option parsing a bit

Prettier does some extra validation and conversion, but let's just be
lazy, skip the validation, and let minimist do the conversion.