v0.4.2

• added some more release targets
• new creatures:
  • jellyfish (from nothub/asciiquarium)
  • happy little crab
• fixed progressively empty aquarium after shark kills
• malloc() fixes
• -M|--message-color to set a background text color
• slower castle re-build after kaiju-related incidents
• moving waves

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static builds (see build action)