*) mod_md v2.2.3: - Configuring MDCAChallenges replaces any previous existing challenge configuration. It had been additive before which was not the intended behaviour. [@mkauf] - Fixing order of ACME challenges used when nothing else configured. Code now behaves as documented for `MDCAChallenges`. Fixes #156. Thanks again to @mkauf for finding this. - Fixing a potential, low memory null pointer dereference [thanks to @uhliarik]. - Fixing an incompatibility with a change in libcurl v7.66.0 that added unwanted "transfer-encoding" to POST requests. This failed in directy communication with Let's Encrypt boulder server. Thanks to @mkauf for finding and fixing.