v0.3.9

AbstractGPs v0.3.9

Diff since v0.3.8

Closed issues:

• Move test utilities inside src (#112)

Merged pull requests:

• Add Zenodo badge (#188) (@theogf)
• clean up directory structure (#196) (@st--)
• update test/ directory structure to sync with src/ (#199) (@st--)
• _map -> _map_meanfunction (#200) (@st--)
• Docstring typo fixes (#201) (@st--)