Update README.md

[fenilgmehta]

• The basic usage example programs have been updated so that they can be executed by directly copying them into the python console without having to make any changes to see the library work.
• Under Additional Features point 1, wrong variable was used (line 74). This has been fixed.
  print(e.logdata_time) ---> print(e.logtime_data)
• Update the console output under Additional Features point 2 (line 84) as only 4 digits after the decimal are printed in the latest version.