Version 3.1.0

• Added support for PNGs with color palettes (PLTE) (#4)
• Resolve promise on completing printImage (#3)
• Updated broken image URLs (#5)
• Fixed bug where some transparent images wouldn't display properly
• Fixed bug where very small images wouldn't be displayed at the requested size
• Formatted using deno fmt and code is now (more) compliant with deno lint (#6)

Thanks to everyone who reported the issues above. :)