fix: correct badge links

README.md

@@ -1,11 +1,11 @@
 # Abortable Rx
 
-[![npm](https://img.shields.io/npm/v/abortable-rx.svg?maxAge=2592000)](https://www.npmjs.com/package/abortable-rx)
-[![downloads](https://img.shields.io/npm/dm/abortable-rx.svg?maxAge=2592000)](https://www.npmjs.com/package/abortable-rx)
-[![build](https://travis-ci.org/felixfbecker/node-abortable-rx.svg?branch=master)](https://travis-ci.org/felixfbecker/node-abortable-rx)
-[![codecov](https://codecov.io/gh/felixfbecker/node-abortable-rx/branch/master/graph/badge.svg)](https://codecov.io/gh/felixfbecker/node-abortable-rx)
-[![dependencies](https://david-dm.org/felixfbecker/node-abortable-rx.svg)](https://david-dm.org/felixfbecker/node-abortable-rx)
-[![license](https://img.shields.io/npm/l/abortable-rx.svg?maxAge=2592000)](https://github.com/felixfbecker/node-abortable-rx/blob/master/LICENSE.txt)
+[![npm](https://img.shields.io/npm/v/abortable-rx.svg)](https://www.npmjs.com/package/abortable-rx)
+[![downloads](https://img.shields.io/npm/dm/abortable-rx.svg)](https://www.npmjs.com/package/abortable-rx)
+[![build](https://travis-ci.org/felixfbecker/abortable-rx.svg?branch=master)](https://travis-ci.org/felixfbecker/abortable-rx)
+[![codecov](https://codecov.io/gh/felixfbecker/abortable-rx/branch/master/graph/badge.svg)](https://codecov.io/gh/felixfbecker/abortable-rx)
+[![dependencies](https://david-dm.org/felixfbecker/abortable-rx.svg)](https://david-dm.org/felixfbecker/abortable-rx)
+[![license](https://img.shields.io/npm/l/abortable-rx.svg)](https://github.com/felixfbecker/abortable-rx/blob/master/LICENSE.txt)
 [![code style: prettier](https://img.shields.io/badge/code_style-prettier-ff69b4.svg)](https://github.com/prettier/prettier)
 [![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)