🔖 Release 1.0

• ✨ CLI arg, '--color-schemeand environment variableGIMOJI_COLOR_SCHEMEto specify the scheme, with 2 possible values:lightanddark`. The color scheme autodetection is great but
  problematic at times, e.g in case of being run as git commit hook, which is the primary use
  case.
• 💥 Color scheme specification now mandatory with git hook. When running as the git commit hook,
  we now require the color scheme to be explicitly specified. If it's not specified, we ask the user
  to re-install the hook (which is just one command). #69
• 🚑️ Don't chop off content of commit message. When adding emoji to an existing commit message.
• 💥 Drop deprecated --update-cache option.
• 🔥 Enable LTO for release build.
• 🔥 Remove exec line from git hook. We no longer need this hack.
• ✨ Set the colorscheme arg in commit hook command.
• ⬆️ Update arboard to 3.3.2.
• ⬆️ Update nix to 0.28.