Version 0.8.1

A correction and documentation improvement:

• #214 Solve a bug in the engine when using delta connected flexible loads.
• #213 Better detection of poorly connected elements as described in #209. It raises a proper error
  message.
• #211 Several improvements of the documentation:
  • Add Open Graph metadata to the documentation page.
  • Error on the susceptance unit in the tables of the LineParameters' catalogue.
  • Replot the networks of the catalogue (add a H1 title, use the Raleway font, only plot the lines to add their
    parameters id in the tooltip)

What's Changed

• Improvements of the documentation (opengraph, networks' catalogue plotting) by @benoit9126 in #211
• Poorly connected elements by @Saelyos in #213
• Version 0.8.1 by @benoit9126 in #215

Full Changelog: v0.8.0...v0.8.1