Bump version to 0.3.3HEADmaster

This change bumps the version of the crate to 0.3.3. The following
notable changes have been made since 0.3.2:
- Added bash completion support via shell-complete utility program
- Updated minimum required Rust version to 1.40.0
- Converted Cargo.lock to new lock file format
- Bumped libc dependency to 0.2.69
- Bumped structopt dependency to 0.3.13
- Bumped various transitive dependencies to most recent versions

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