feat(rules): Added Timezone rule

Author: ricardogobbosouza

README.md

@@ -227,6 +227,7 @@ The library can be loaded either as a standalone script, or through an [AMD](htt
 - [SymbolVal](docs/symbol-val.md)
 - [SymbolicLink](docs/symbolic-link.md)
 - [Time](docs/time.md)
+- [Timezone](docs/timezone.md)
 - [Tld](docs/tld.md)
 - [TrueVal](docs/true-val.md)
 - [TypeOf](docs/type-of.md)

docs/timezone.md

@@ -0,0 +1,19 @@
+# Timezone
+
+Validates if the given input is a timezone.
+
+Valid values:
+
+```js
+validator.timezone().validate('Europe/Paris');
+validator.timezone().validate('US/Central');
+validator.timezone().validate('America/Sao_Paulo');
+```
+
+Invalid values:
+
+```js
+validator.timezone().validate('invalid/timezone');
+validator.timezone().validate(null);
+validator.timezone().validate(undefined);
+```

src/rules/index.ts

@@ -145,6 +145,7 @@ export * from './symbol-type';
 export * from './symbol-val';
 export * from './symbolic-link';
 export * from './time';
+export * from './timezone';
 export * from './tld';
 export * from './true-val';
 export * from './type-of';