tag release v0.3.0

[dehann]

@JuliaRegistrator register branch=release/v0.3

[JuliaRegistrator]

Error while trying to register: Error in (Julia)Project.toml: UUID b5cc3c7e-6572-11e9-2517-99fb8daf2f04 refers to package 'DistributedFactorGraphs' in registry but Project.toml has 'Graphs'

[dehann]

@JuliaRegistrator register branch=release/v0.3

[JuliaRegistrator]

Registration pull request created: JuliaRegistries/General/108205

Tip: Release Notes

Did you know you can add release notes too? Just add markdown formatted text underneath the comment after the text
"Release notes:" and it will be added to the registry PR, and if TagBot is installed it will also be added to the
release that TagBot creates. i.e.

@JuliaRegistrator register

Release notes:

## Breaking changes

- blah

To add them here just re-invoke and the PR will be updated.

Tagging

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 the Julia TagBot GitHub Action is installed, or can be done manually through the github interface, or via:

git tag -a v0.3.0 -m "<description of version>" 6464413eb90fe1b7daa421f5f4cdf6113d16d149
git push origin v0.3.0