Fixed the bug in the fix

Sorry the fix in last relase had bug!

Fixed a bug in ADS1115.cpp

When changing the range, the lower alarm limit has not been updated correctly.

Renamed one function, some amendments of examples

• renamed unlatchAlert to clearAlert, since unlatch could be misleading
• small error "ADS1115_ASSERT_AFTER_3" does not exist -> changed to "ADS1115_ASSERT_AFTER_4"
• changed function list accordingly
• examples contained few lines of redundant code

Initial Release

This is the initial release of the library. I have tested it extensively.