Merge pull request #3 from thisisyusub/master

Update doc for isNull method

README.md

@@ -25,7 +25,6 @@ The is a new fork of [validator.dart](https://github.com/karan/validator.dart),
 - **isInt(String str)** - check if the string is an integer.
 - **isFloat(String str)** - check if the string is a float.
 - **isDivisibleBy(String str, number)** - check if the string is a number that's divisible by another.
-- **isNull(String str)** - check if the string is null.
 - **isLength(String str, min [, max])** - check if the string's length falls in a range. Note: this function takes into account surrogate pairs.
 - **isByteLength(String str, min [, max])** - check if the string's length (in bytes) falls in a range.
 - **isUUID(String str [, version])** - check if the string is a UUID (version 3, 4 or 5).
@@ -58,4 +57,4 @@ The is a new fork of [validator.dart](https://github.com/karan/validator.dart),
 - **stripLow(String input [, keep_new_lines])** - remove characters with a numerical value < 32 and 127, mostly control characters. If `keep_new_lines` is `true`, newline characters are preserved (`\n` and `\r`, hex `0xA` and `0xD`). Unicode-safe in JavaScript.
 - **whitelist(String input, chars)** - remove characters that do not appear in the whitelist. The characters are used in a RegExp and so you will need to escape some chars, e.g. whitelist(String input, '\\[\\]').
 - **blacklist(String input, chars)** - remove characters that appear in the blacklist. The characters are used in a RegExp and so you will need to escape some chars, e.g. blacklist(String input, '\\[\\]').
-- **normalizeEmail(String email [, options])** - canonicalize an email address. `options` is an object which defaults to `{ lowercase: true }`. With `lowercase` set to `true`, the local part of the email address is lowercased for all domains; the hostname is always lowercased and the local part of the email address is always lowercased for hosts that are known to be case-insensitive (currently only GMail). Normalization follows special rules for known providers: currently, GMail addresses have dots removed in the local part and are stripped of tags (e.g. `[email protected]` becomes `[email protected]`) and all `@googlemail.com` addresses are normalized to `@gmail.com`.
+- **normalizeEmail(String email [, options])** - canonicalize an email address. `options` is an object which defaults to `{ lowercase: true }`. With `lowercase` set to `true`, the local part of the email address is lowercased for all domains; the hostname is always lowercased and the local part of the email address is always lowercased for hosts that are known to be case-insensitive (currently only GMail). Normalization follows special rules for known providers: currently, GMail addresses have dots removed in the local part and are stripped of tags (e.g. `[email protected]` becomes `[email protected]`) and all `@googlemail.com` addresses are normalized to `@gmail.com`.