New version: Oceanostics v0.15.0

[JuliaRegistrator]

• Registering package: Oceanostics
• Repository: https://github.com/tomchor/Oceanostics.jl
• Created by: @tomchor
• Version: v0.15.0
• Commit: 5c16f892e9a5808d49c7876d18e13c38aa710bdb
• Reviewed by: @tomchor
• Reference: tomchor/Oceanostics.jl@5c16f89#commitcomment-150921834
• Description: Diagnostics for Oceananigans
• Release notes:

## Breaking changes

- Removed `add_background` option from `RichardsonNumber` and `ErtelPotentialVorticity`, and generalized definition of `ErtelPotentialVorticity`.

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