v0.15.0

• Fix bug with null / empty geometry introduced in commit 326e3c8 / version 0.13.2.

• Improve the label creation popup to enable the creation of multiple labels at once, while being able to select the font and the font size for each field.

• Automatically stack labels for the same feature to avoid overlap (thanks to @robLittiere and @ArmelVidali / see PR #109).

• Update smoomapy dependency to fix some issue when bounds given by the user are very close to the min/max bounds of the data (and that could result in a class without value).