fix: add LICENSE

Closes #11

Author: felixfbecker

LICENSE

@@ -0,0 +1,15 @@
+ISC License
+
+Copyright (c) 2016, Felix Frederick Becker
+
+Permission to use, copy, modify, and/or distribute this software for any
+purpose with or without fee is hereby granted, provided that the above
+copyright notice and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

README.md

@@ -4,7 +4,7 @@
 [![Build Status](https://travis-ci.org/felixfbecker/php-advanced-json-rpc.svg?branch=master)](https://travis-ci.org/felixfbecker/php-advanced-json-rpc)
 [![Coverage](https://codecov.io/gh/felixfbecker/php-advanced-json-rpc/branch/master/graph/badge.svg)](https://codecov.io/gh/felixfbecker/php-advanced-json-rpc)
 [![semantic-release](https://img.shields.io/badge/%20%20%F0%9F%93%A6%F0%9F%9A%80-semantic--release-e10079.svg)](https://github.com/semantic-release/semantic-release)
-[![License](https://img.shields.io/packagist/l/felixfbecker/advanced-json-rpc.svg)](https://packagist.org/packages/felixfbecker/advanced-json-rpc)
+[![License](https://img.shields.io/packagist/l/felixfbecker/advanced-json-rpc.svg)](https://github.com/felixfbecker/php-advanced-json-rpc/blob/master/LICENSE)
 
 Provides basic classes for requests and responses in JSONRPC and a `Dispatcher` class that can decode a JSONRPC request
 and call appropiate methods on a target, coercing types of parameters by type-hints and `@param` tags.