fix: typo in test

Author: BridgeAR

test/parsers.spec.js

@@ -44,7 +44,7 @@ describe('parsers', function () {
           returnError: true
         })
       }, function (err) {
-        assert.strictEqual(err.message, 'The options argument contains the property "returnError" that is either unkown or of a wrong type')
+        assert.strictEqual(err.message, 'The options argument contains the property "returnError" that is either unknown or of a wrong type')
         assert(err instanceof TypeError)
         return true
       })