New version: ProblemReductions v0.3.0

[JuliaRegistrator]

• Registering package: ProblemReductions
• Repository: https://github.com/GiggleLiu/ProblemReductions.jl
• Created by: @GiggleLiu
• Version: v0.3.0
• Commit: 04ba1715249fb309f766dc1e61e44aa641da4273
• Reviewed by: @GiggleLiu
• Reference: Register package GiggleLiu/ProblemReductions.jl#72 (comment)
• Description: Reduction between computational hard problems.
• Release notes:

## Breaking changes
- Refactor the ConstraintSatisfactionProblem interfaces: Now we use `constraints` and `objectives` to specify the constraints.
- Change the convension of size of satisfiability problems, now the size is defined by the satisfied constraints rather than unsatisfied constraints.
- Allow specifying satisfiability problems as hard constraints.

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