v0.5.0-beta.2 - Data Logging Improvements

This version improves the data logging mechanism by automatically flushing the log data buffer to disk if:

• it has been 2 seconds or more since the last serial data was received, or
• it has been 10 seconds or more since the last time the buffer was flushed

This should prevent situations where it takes a long time for data to be dumped to the log due to sporadic incoming data, or regular but very small chunks of incoming data.

Additionally, the SimplySerial version is now displayed as part of the standard help message (to make identifying the currently installed version easier.).