doc: Update README, add CHANGELOG, roll version to 0.4.0

Update dependencies to make gtk deps match again

Fixes qdot#26

doc: Roll build to 0.2.0 for linux release

Punting qdot#15 (icon text for linux) back to v0.3 and releasing 0.2 so
that linux support is on crates.io.

Fixes #5

build: Roll version number for windows icon blob load

chore: Un-* lib versions