This is a patch release.

Bugs fixed:

• #1162 upstream naming pre-empts proxy-passing to other load-balanced services (fixed by #1163)
• #1361, #1407 and #1512 bad parsing of the arguments passed to the DH parameters generation script (fixed by #1263)
• #1424 nginx config load broken by resolver's IPv6 link local interface scoped address (fixed by #1557)
• X-Forwarded-Ssl header was improperly set in SSL-terminated setups (fixed by #1185)
• create_server_certificate.sh script in tests was broken (fixed by #1619)
• #1132 upstream server was incorrectly marked as down when using internal networks (fixed by #1609)

Changes since 0.9.0:

• new SERVER_TOKENS per proxied container variable to control the server_tokens directive (#1620)
• additional debug information on the rendered template with the DEBUG variable (#1609)
• $upstream_addr added to nginx access logs (#1659)
• switch to a Go module compatible version of forego (#1603)
• golang 1.15.10 -> 1.16.5

Various doc updates.