Algernon 1.15.0

• Compile the release binaries with Go 1.20.4.
• Add a close() function, ref #124 (thanks Malcolm Ke Win / @diyism).
• Add a shell linter to the CI configuration, ref #120 (thanks Jan Macku / @jamacku).
• Support reverse proxies, ref #131 (thanks Mohamed Abdel Maksoud / @mohamed--abdel-maksoud).
• Look for handler.lua in parent directories, ref #95, #112 and #130 (thanks Giulio Lunati / @giuliolunati).
• Add initial support for JWT tokens.
• Use os and ioinstead of the deprecated ioutil package.
• Use any instead of interface{}.
• Use the new unix build constraint.
• Use strings.ReplaceAll and bytes.ReplaceAll.
• Use simpleredis/v2.
• Use math.Round.
• Add an ulimit check to the welcome.sh script that also works on macOS Ventura.
• Format/lint the code with gofumpt, golint and staticcheck.
• Use the betteralign tool, to improve struct field alignment.
• Make the code debug/tracing/profiling features optional at compile time, using build tags.
• Fix a typo in one of the examples.
• Update the CI configuration.
• Update dependencies.
• Update documentation.