v0.1.0

• Initial release
• Support namespaced functions (e.g. log.info, log.error) when sourcing.
• Support CLI execution (e.g. shwain warn "My Warning Message")
• Support JSON formatting.
• Allow configuring most aspects of the logger via env vars.
• Support enriching with metadata via CLI flag or env var.
• Support enrching with EC2 instance-specific metadata when available.
• Color severity levels accordingly.
• Support event severity type.