1.48.1

• Fix bash completion of command lines containing : (#3205 by casey)
• Call zsh completion function when first auto-loaded (#3199 by casey)
• Fix --set missing value error message interpolation (#3198 by cuiweixie)
• Add #compdef to zsh completion script (#3197 by casey)
• Add instructions for alias completions in bash (#3190 by casey)
• Remove redundant clap derive attributes (#3183 by casey)
• Move files into etc/ (#3182 by casey)
• Update stable features in readme (#3181 by casey)