Release 0.3.1

[tkf]

@JuliaRegistrator register(branch=release)

[JuliaRegistrator]

Error while trying to register: Julia version < 0.7 not allowed in [compat]

[tkf]

@JuliaRegistrator register(branch=release)

[JuliaRegistrator]

Registration pull request created: JuliaRegistries/General/827

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 v0.3.1 -m "<description of version>" 967c0aad3b6bde1b91cc5575627d56cb2afaeb82
git push origin v0.3.1