Update README.md

Add donate button to readme.
boynux · Mar 13, 2020 · df66362 · df66362
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 [![Build Status](https://travis-ci.org/boynux/squid-exporter.svg?branch=master)](https://travis-ci.org/boynux/squid-exporter)
 [![Go Report Card](https://goreportcard.com/badge/github.com/boynux/squid-exporter)](https://goreportcard.com/report/github.com/boynux/squid-exporter)
 [![Maintainability](https://api.codeclimate.com/v1/badges/a99a88d28ad37a79dbf6/maintainability)](https://codeclimate.com/github/boynux/squid-exporter)
+[![Donate](https://img.shields.io/badge/Donate-PayPal-green.svg)](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=3TH7YAMMEC5L4&source=url)
+
+
 
 Squid Prometheus exporter
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