New version: AstroProp v0.4.0

[JuliaRegistrator]

• Registering package: AstroProp
• Repository: https://github.com/GenAstro/Epicycle
• Created by: @stevenhughes73
• Version: v0.4.0
• Commit: 73bee6310a5e99fbc89a525d14f4b408c38bd19a
• Reviewed by: @stevenhughes73
• Reference: GenAstro/Epicycle@73bee63#commitcomment-174362346
• Description: An application for space systems with a nod to the giants who came before us and to how far we’ve come.
• Release notes:

Breaking: Updated dependencies for compatibility with updated ecosystem packages. Added new stopping condition functionality for propagation control including time-based conditions.  Updated propagate() function to have "!" since it mutates.

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