Pennsieve

Fixed
- Uploading on Windows and Cygwin with the Agent

Changed
- Relaxed requirement on protobuf

Breaking Changes
- Uploading now uses the Pennsieve CLI Agent by default. Visit <https://developer.pennsieve.io/agent/> for installation instructions. You can pass `use_agent=True` to continue to use the legacy uploader.
- Most of the functionality in the `bf` command line script has been removed. The script has been renamed `bf_profile` and only manages Pennsieve profiles. The Pennsieve CLI Agent is now the recommended command line interface to the platform.
- Removed the deprecated `set_type` and `set_value` methods
- Removed the `streaming_api_host` argument from the `Pennsieve` client
- Removed the deprecated `get_collaborators`, `add_collaborators`, and `remove_collaborators` methods

Fixed
- Equality checks for Pennsieve objects

Fixed
- A bug in `Model.create_records` when adding array-valued properties

Fixed
- Adding and retrieving array model values
- The body of HTTP errors is now shown to users in raised exceptions

Added
- Support for linked properties

Changed
- Deprecated the `set_type` method on model properties. You can set property types using `ModelProperty.type` directly.
- Deprecated the `set_value` method on model values. You can now set property values using `ModelValue.value` directly.

Fixed
- Incorrect version

Added
- Documentation about release