v2.0.0

Full Changelog

Implemented enhancements:

• BREAK: Update library to match IDE 1.5 spec v2.1 #81 (4-20ma)
• Use platformio to build multiple boards #79 (4-20ma)

Closed issues:

• Use platformio to build against multiple boards #78
• Add ruby files to .gitignore #75
• Reorder Installation section of README #73
• Update README #71
• Rename HISTORY to CHANGELOG #47
• Update library to match 1.5 specification #14

Merged pull requests:

• Use relative path to examples #80 (4-20ma)
• Add files to .gitignore #76 (4-20ma)
• Reorder installation section of README #74 (4-20ma)
• Update README #72 (4-20ma)
• Automate CHANGELOG generation #68 (4-20ma)