Release version 0.3.0

[ahojukka5]

This version uses Tensors.jl to get better performance.

@JuliaRegistrator register()

[JuliaRegistrator]

Error while trying to register: "File (Julia)Project.toml not found"

[ahojukka5]

@JuliaRegistrator register()

[JuliaRegistrator]

Registration pull request created: JuliaRegistries/General/5876

After the above pull request is merged, it is recommended that a tag is created on this repository for the registered package version.

This will be done automatically if Julia TagBot is installed, or can be done manually through the github interface, or via:

git tag -a v0.3.0 -m "<description of version>" 691ad9d94c4c1eda2233718e6328397a411bdb13
git push origin v0.3.0