v0.3.0

Changed

• Changed error returns to return {:error, reason} rather than just :error.
  This is a backwards incompatible change if your code matches on :error.
• Changed retry semantics to only retry on CRC mismatch errors. Previously, CRC
  mismatches were not retried and retries were done at the I2C transaction
  level. Retrying on the I2C level wasn't effective and ended up causing long
  delays. So far, CRC errors are the ones worth retrying since they happen rare
  enough that a retry is pretty much guaranteed to work.