Validate method typing in TS improved

Validate method type for TypeScript is now more accurate.

release 1.3.6 state only string type in TS bug fixed

release 1.3.6 state only string type in TS bug fixed. Now you can pass to state any type.

Fixed types for main module

Merge pull request #28 from nullgr/release/1.3.5

Release/1.3.5

v1.3.3

1.3.3

Type Definitions

Added type definitions(.d.ts files), so library can be used in typescript projects with full typescript power

Added isFieldValid method

Added isFieldValid method

Added updater function support

Added updater function support in validate method.