New version: HetaSimulator v0.6.0

[JuliaRegistrator]

• Registering package: HetaSimulator
• Repository: https://github.com/hetalang/HetaSimulator.jl
• Created by: @ivborissov
• Version: v0.6.0
• Commit: 2d24be405b0d670962b593e6a58930064c1e879e
• Reviewed by: @ivborissov
• Reference: Register new version hetalang/HetaSimulator.jl#35 (comment)
• Description: Simulation engine for Heta-based models
• Release notes:

```
- NodeJS dep removed. heta exe depoyed as artifact without node intallation
- fitting issue with additional parameters fixed
```

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