typo in isMD5

README.md

@@ -85,7 +85,7 @@ Passing anything other than a string is an error.
 - **isLength(str, options)** - check if the string's length falls in a range. `options` is an object which defaults to `{min:0, max: undefined}`. Note: this function takes into account surrogate pairs.
 - **isLowercase(str)** - check if the string is lowercase.
 - **isMACAddress(str)** - check if the string is a MAC address.
-- **isMD5s(str)** - check if the string is a MD5 hash.
+- **isMD5(str)** - check if the string is a MD5 hash.
 - **isMobilePhone(str, locale)** - check if the string is a mobile phone number, (locale is one of `['ar-DZ', 'ar-SY', 'cs-CZ', 'de-DE', 'da-DK', 'el-GR', 'en-AU', 'en-GB', 'en-HK', 'en-IN', 'en-NZ', 'en-US', 'en-CA', 'en-ZA', 'en-ZM', 'es-ES', 'fi-FI', 'fr-FR', 'hu-HU', 'ms-MY', 'nb-NO', 'nn-NO', 'pl-PL', 'pt-PT', 'ru-RU', 'tr-TR', 'vi-VN', 'zh-CN', 'zh-TW']`).
 - **isMongoId(str)** - check if the string is a valid hex-encoded representation of a [MongoDB ObjectId][mongoid].
 - **isMultibyte(str)** - check if the string contains one or more multibyte chars.