Bump version to 0.3.4

This change bumps the version of the crate to 0.3.4. The following
notable changes have been made since 0.3.3:
- Changed default OTP format from hex to base32
- Improved error reporting format and fidelity
  - Added anyhow dependency in version 1.0.32
- Updated minimum required Rust version to 1.42.0
- Bumped nitrokey dependency to 0.7.1
- Bumped proc-macro2 dependency to 1.0.19
- Bumped syn dependency to 1.0.36

Author: d-e-s-o

CHANGELOG.md

@@ -1,5 +1,5 @@
-Unreleased
-----------
+0.3.4
+-----
 - Changed default OTP format from `hex` to `base32`
 - Improved error reporting format and fidelity
   - Added `anyhow` dependency in version `1.0.32`

Cargo.lock

@@ -19,7 +19,7 @@
 
 [package]
 name = "nitrocli"
-version = "0.3.3"
+version = "0.3.4"
 edition = "2018"
 authors = ["Daniel Mueller <[email protected]>"]
 license = "GPL-3.0-or-later"