Update badge link for CI tests in README

Author: lemire

README.md

@@ -1,5 +1,4 @@
-# gocroaring   [![GoDoc](https://godoc.org/github.com/RoaringBitmap/gocroaring?status.svg)](https://godoc.org/github.com/RoaringBitmap/gocroaring) ![Tests (Ubuntu, macOS)](https://github.com/RoaringBitmap/gocroaring/workflows/Tests%20(Ubuntu,%20macOS)/badge.svg)
-
+# gocroaring   [![GoDoc](https://godoc.org/github.com/RoaringBitmap/gocroaring?status.svg)](https://godoc.org/github.com/RoaringBitmap/gocroaring) [![Tests (Ubuntu, macOS)](https://github.com/RoaringBitmap/gocroaring/actions/workflows/test.yml/badge.svg)](https://github.com/RoaringBitmap/gocroaring/actions/workflows/test.yml)
 Well-tested Go wrapper for [CRoaring](https://github.com/RoaringBitmap/CRoaring) (a C/C++ implementation of Roaring Bitmaps)
 
 Roaring bitmaps are used by several important systems: