Update crate version: 0.1.2 -> 0.1.3

v0.1.3 (with doc attributes)

Update crate version: 0.1.1 -> 0.1.2

v0.1.2 (with doc attributes)

Merge pull request #777 from godot-rust/feature/prepare-crates-2

Packaging preparations II

v0.1.1 (with doc attributes)