Update README.md

 Bump firmware to 3.7.0 and delete unused variable

Merge pull request #152 from AxxAxx/dev

Dev

Update README to clarify graph description

Merge pull request #144 from AxxAxx/dev

Dev

Update README.md

Merge pull request #134 from AxxAxx/dev

Dev

Merge pull request #131 from AxxAxx/dev

Dev

Merge pull request #116 from AxxAxx/dev

Dev

Merge pull request #115 from AxxAxx/dev

Dev