Adds support for different ADC resolutions

What's Changed

• Replace switch ASCII art with mirror image by @dltj in #26
• Update README.md "2 bits" => "2 pieces" of info by @JimJJewett in #27
• Configurable ADC resolution by @rlogiacco in #49

New Contributors

• @dltj made contribution in #26
• @JimJJewett made contribution in #27
• @rlogiacco made contribution in #49

Full Changelog: 1.1.1...1.2.0