v1.6.15

• Last release of v1 and v2 is replacing it on main branch soon.
• Updated markdown matchers to be bold (double asterisk), italic (double underscore), linethrough (double tilde) and code (single backtick).
• Removed PopScope since new api requires Flutter v3.22 and I want to still support older versions. Let me know if it introduces breaking behaviour.
• Added support for AssetImage (uri starts with assets/). Thanks @thomers for the PR!