Bugfix release

This change contains the following updates:

• This package is now using Semver for versioning, as per
  https://github.com/golang/go/wiki/Modules#semantic-import-versioning
• Documentation updates

v5.0.3: Marshalling fix (#59)

Changes

• Added new type for Kubernetes cluster update requests
• Made the entities field marshalled again for KubernetesCluster objects
• Updated documentation

Update for compatibility with API v5

This release includes the following changes:

• Full compatibility with API v5
• Documentation has been updated
• The SDK can now be used to manage Backup Units
• The SDK can now be used to manage S3 User Keys

Release v5.0.1

• ApiError object is made public #35
• UpdateIPBlock added #34
• Allowing overriding of default Profit Bricks Cloud API url in unit tests #36

Release v5.0.0 - Sessions and error handling

This update includes the following backward incompatible changes:

• Improved client sessions allowing for multiple sessions.
• Added Go error handling
• Updated README

v4.0.4

#30 Retry HTTP request
#31 Test fix

Release v4.0.3 - DHCP Fix

Fixed how DHCP flag is serialised into JSON.

v4.0.2

The release contains a minor change to the Lan Objects:

• Introduced CreateLan object
• Allow Patching of Lans without omitting empty array of failover groups.

v4.0.1

The release contains changes to unit tests and a minor change:

• Updated unit test coverage to cover all operations
• Changed the return type of GetResourceByType operation

Release v4.0.0 - Cloud API v4

The SDK has been updated to support the latest ProfitBricks Cloud API v4 features:

• Added User Management feature
• Added Contract Resources feature
• Added Image Aliases feature
• Added a new location and license type
• Added IP Address fail-over feature
• Added and updated tests
• Added additional negative tests