doc: Update version/CHANGELOG for 0.9.2

doc: Update version/CHANGELOG for v0.9.1

Prepare for 0.9.0 release.

doc: Update version/CHANGELOG for 0.8.1

doc: Add more 0.8 info to README.

build: Back down windows dependency to 0.3.1 for 0.7.3 release

Compat issues otherwise.

doc: Update version/CHANGELOG for 0.7.2

doc: Update version/CHANGELOG for 0.7.1

doc: Update changelog with extra breaking change

build: Depend on the minor version of backtrace

Otherwise this causes nasty conflicts up the dependency chain