v0.3.0

• ck subscribers learned to filter subscribers via --since, --until, --cancelled, and --email.
• Also, --reverse will now list results in reverse order.
• Auto-generate Homebrew formula when tagging a new release.

v0.2.0

• Introduce ck subscribers and ck version commands.
• Add --api-key, --api-secret, and --api-endpoint options.
• Rename CONVERTKIT_ENDPOINT env var to CONVERTKIT_API_ENDPOINT for consistency.
• Return error if API secret is required, but not present.
• Document installation via Homebrew.

v0.1.0

• Initial release.