Updated Readme.md with 1.0.3-Alpha1

New sensor event handlers:
  * Acceleration (active/inactive) event added and tested
  * Water (wet/dry) event added, to be tested..., Need someone to test.
  * Smoke (detected/clear/tested) event added, to be tested (without burning a house down, please!)..., Need someone to test.
  * Button (press) event added, to be tested..., Need someone to test.