v0.3.1

Mangal v0.3.1

Diff since v0.3.0

Merged pull requests:

• JOSS paper (#15) (@FrancisBanville)
• Slight clarification of installation instructions (#16) (@FrancisBanville)
• CompatHelper: bump compat for "HTTP" to "0.9" (#17) (@github-actions[bot])
• Prepare compatiblity with EcologicalNetworks 0.4 (#18) (@tpoisot)