Update version number to 2.8.2-dev
Update version number to 2.8.2-dev

Following the release of Quilt 2.8.1 on PyPI, increment the version
number to 2.8.2-dev.

quiltdata/quilt-compiler,quiltdata/quilt,quiltdata/quilt-compiler,quiltdata/quilt-compiler,quiltdata/quilt,quiltdata/quilt,quiltdata/quilt-compiler,quiltdata/quilt,quiltdata/quilt