Remove appveyor badge and replace it with os zoo badge

We don't use appveyor anymore. Replace it with the os zoo badge, so we
can more persistently see when its breaking

Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Paul Dale <ppzgs1@gmail.com>
(Merged from https://github.com/openssl/openssl/pull/24762)

diff --git a/README.md b/README.md
index bf4ae91524991aef05443a46a62a59040f565c96..9d1344b12df340db6f6a9350938866307500cd23 100644 (file)
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@ Welcome to the OpenSSL Project
 [![openssl logo]][www.openssl.org]
 
 [![github actions ci badge]][github actions ci]
-[![appveyor badge]][appveyor jobs]
+![Nightly OS Zoo ci badge](https://github.com/openssl/openssl/actions/workflows/os-zoo.yml/badge.svg)
 
 OpenSSL is a robust, commercial-grade, full-featured Open Source Toolkit
 for the TLS (formerly SSL), DTLS and QUIC (currently client side only)