update README.md

Author: fanatid

README.md

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+# browserify-rsa
+
+[![NPM Package](https://img.shields.io/npm/v/browserify-rsa.svg?style=flat-square)](https://www.npmjs.org/package/browserify-rsa)
+[![Build Status](https://img.shields.io/travis/crypto-browserify/browserify-rsa.svg?branch=master&style=flat-square)](https://travis-ci.org/crypto-browserify/browserify-rsa)
+[![Dependency status](https://img.shields.io/david/crypto-browserify/browserify-rsa.svg?style=flat-square)](https://david-dm.org/crypto-browserify/browserify-rsa#info=dependencies)
+
+[![js-standard-style](https://cdn.rawgit.com/feross/standard/master/badge.svg)](https://github.com/feross/standard)
+
+RSA private decryption/signing using chinese remainder and blinding.
+
+## API
+
+Give it a message as a Buffer and a private key (as decoded by `ASN.1`) and it returns encrypted data as a Buffer.
+
+## LICENSE
+
+MIT