MarkNotes 0.1.6

Smaller APKs with R8 code optimization and resource shrinking.

What's Changed

• Update the F-Droid MR description for v0.1.5 by @MaxDac in #49
• Add an F-Droid review handover for reviewer follow-up by @MaxDac in #50
• Optimize F-Droid release APKs with R8 by @MaxDac in #51
• Release 0.1.6 by @github-actions[bot] in #52

Full Changelog: v0.1.5...v0.1.6