6.0.0: PHP 8.4 compatibility

• Heads up: Dropped support for PHP < 7.4, see xp-framework/rfc#343
  (@thekid)
• Fixed Implicitly marking parameter [...] as nullable is deprecated
  warning with PHP 8.4
  (@thekid)

5.2.0: XP 12 compatibility

• Made compatible with XP 12 - @thekid

5.1.0: Provisioning URIs

• Merged PR #4: Allow passing util.Secret instances to time- and counter
  based algorithms directly (the "be liberal in what you accept" paradigm)
  (@thekid)
• Merged PR #3: Add provisioningUri() method to time- and counter-based
  algorithms
  (@thekid)

5.0.1: XP 11 compatibility

• Made library compatible with XP 11 - @thekid

5.0.0: Drop PHP 5 support

• Implemented xp-framework/rfc#334: Drop PHP 5.6:
  . Heads up: Minimum required PHP version now is PHP 7.0.0
  (@thekid)

4.0.1: XP10 compatibility

• Made compatible with XP 10 - @thekid

4.0.0: Random implementation

• Heads up: Dropped support for XP6, minimum required XP version
  is now 7.3.0, which includes the util.Random class
  (@thekid)
• Replaced random implementation inside Secrets with util.Random
  from the XP Framework
  (@thekid)

3.1.0: Prevent incorrect use

• Prevented Secret class from being used directly; either instantiate
  a SecretBytes or SecretString class instead!
  (@thekid)

3.0.0: XP9 Compatibility

• Heads up: Dropped PHP 5.5 support - @thekid
• Added compatibility with XP 8 and XP 9 - @thekid
• Implemented lang.Value instead of extending lang.Object - @thekid

2.0.0: XP7 compatibility

• Added version compatibility with XP 7 - @thekid