fix: breaking changes from beta channel

[Mayb3Nots]

Fixes #361, #335

The parameters for TextSelectionGestureDetectorBuilder has changed. This ensure that in the couple of weeks when Flutter release new stable version the package will be ready to transition smoothly.

Pre-launch Checklist

• [x] I have incremented the package version as appropriate and updated CHANGELOG.md with my changes
• [x] I have added/updated relevant documentation
• [x] I have run "optimize/organize imports" on all changed files
• [x] I have addressed all analyzer warnings as best I could

[GroovinChip]

I think this has been taken care of in #426

[GroovinChip]

Yep, it has. Closing.