Changes with nginx 1.15.3 28 Aug 2018
*) Feature: now TLSv1.3 can be used with BoringSSL.
*) Feature: the "ssl_early_data" directive, currently available with
*) Feature: the "keepalive_timeout" and "keepalive_requests" directives
in the "upstream" block.
*) Bugfix: the ngx_http_dav_module did not truncate destination file
when copying a file over an existing one with the COPY method.
*) Bugfix: the ngx_http_dav_module used zero access rights on the
destination file and did not preserve file modification time when
moving a file between different file systems with the MOVE method.
*) Bugfix: the ngx_http_dav_module used default access rights when
copying a file with the COPY method.
*) Workaround: some clients might not work when using HTTP/2; the bug
had appeared in 1.13.5.
*) Bugfix: nginx could not be built with LibreSSL 2.8.0.