set version to 0.1 to avoid surprises like happened with git-date (#450)

`git-date` remained in `0.0` land which seemed to have allowed version
incompatbility despite the work of cargo-smart-release.

Author: Byron

Cargo.lock

@@ -1,6 +1,6 @@
 [package]
 name = "git-command"
-version = "0.0.0"
+version = "0.1.0"
 repository = "https://github.com/Byron/gitoxide"
 license = "MIT/Apache-2.0"
 description = "A WIP crate of the gitoxide project handling internal git command execution"