README.md: add Coverity badge
The libusb project is available on Coverity at https://scan.coverity.com/projects/libusb-libusb
Signed-off-by: Ludovic Rousseau <ludovic.rousseau@free.fr>
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# libusb
[![Build Status](https://travis-ci.org/libusb/libusb.svg?branch=master)](https://travis-ci.org/libusb/libusb)
+[![Coverity Scan Build Status](https://scan.coverity.com/projects/2180/badge.svg)](https://scan.coverity.com/projects/libusb-libusb)
libusb is a library for USB device access from Linux, Mac OS X,
Windows, OpenBSD/NetBSD and Haiku userspace.