Release 3.0.0

• Fixed silent corruption of LSB messages containing Unicode code points
  above U+00FF (emoji, CJK, accented characters, etc.) with the UTF-8
  encoding: the message is now embedded as its encoded bytes instead of
  8-bit truncated code points
  (~cedric/stegano#4).
  Thanks to ~lechynte.
• Breaking change: the on-image LSB format changed. Images hidden with
  Stegano <= 2.5.0 can only be revealed by this version if they contain
  pure ASCII text with the UTF-8 encoding (that case is bit-identical).
  Non-ASCII UTF-8 messages and all UTF-32LE messages use a different bit
  layout and must be hidden again with the new version.
• Fixed the same Unicode corruption in the wav module: the message is now
  embedded as its encoded bytes, and the 8-bit length prefix stores the
  length of the message in bytes (up to 255) instead of characters.
• Fixed the wav module modifying the least significant bit of every byte
  of the frame data instead of every sample. On 16-bit PCM carriers this
  changed sample amplitudes by up to ±257 (clearly audible and trivially
  detectable); samples now change by at most ±1.
• Breaking change: because of the two fixes above, the wav bit layout
  changed as well. Messages hidden in WAV files with Stegano <= 2.5.0 can
  only be revealed by this version if the message is pure ASCII with the
  UTF-8 encoding and the carrier uses 8-bit samples; anything else must
  be hidden again with the new version.