PlatformIO-based manifest file

Web: http://platformio.ikravets.com/#!/lib/show/MSP430-SHT11
Docs: http://docs.platformio.ikravets.com/en/latest/librarymanager/index.html
Rename li to library.json
Fix non-latin char
Merge pull request #1 from ivankravets/patch-1

PlatformIO-based manifest file