0.15.0

What's Changed

• Fix bug when changing line color (see #448) by @vberthet in #15
• Remove unnecessary imports by @m0nac0 in #34
• Update example with Flutter 2.5.3 by @kuhnroyal in #35
• CI: Use separate scheduled pipeline for Flutter beta builds by @kuhnroyal in #28
• [Breaking Change] Null safety (cherry-pick from upstream) by @m0nac0 in #31
• [web] add missing removeLines, removeCircles and removeFills (cherry-pick tobrun#622) by @m0nac0 in #32
• Replace style string in local style example by @m0nac0 in #33
• [web] add getSymbolLatLng and getLineLatLngs by @m0nac0 in #37

Full Changelog: 0.14.0...0.15.0