Bump version to 0.3.2

This change bumps the version of the crate to 0.3.2. The following
notable changes have been made since 0.3.1:
- Added the list command that lists all attached Nitrokey devices
- Reworked argument handling:
  - Added structopt dependency in version 0.3.7
  - Replaced argparse with structopt
  - Removed argparse dependency
  - Made the --verbose and --model options global
- Removed vendored dependencies and moved source code into repository
  root
- Bumped nitrokey dependency to 0.6.0
- Bumped quote dependency to 1.0.3
- Bumped syn dependency to 1.0.14

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