Release v1.2.2

Include changes from ErriezDS3231 library dependency.
New low-power SD-card logging example.

Release v1.2.1

This release includes:

• New SD-card logging example
• Low-power support (AVR targets)
• Updated examples
• Updated documentation
• Update build scripts
• CMake / PlatformIO removed
• Updated copyright headers
• Fixed white spaces

Release v1.1.1

• Add DUE and ESP32 support
• Simplify ESP8266 and ESP32 pin configuration
• Add PlatformIO library registration
• Change PlatformIO build scripts for local continues integration tests on multiple targets

Release v1.1.0

• Rename library sources to prevent conflicts with other Arduino libraries.
• Move docs directory to gh-branch.
• Add Travis auto-build scripts.
• Add PlatfromIO support.
• Add average calculation.
• Add duration test.
• Add documentation.

Release v1.0.1

Initial version.

Release v1.0.0

Exclude platformio directory in Doxygen.