v0.2.0

• Rename retryhttp.retry_http_errors to retryhttp.retry.
• Rename retryhttp.wait_http_errors to retryhttp.wait_context_aware.
• Restructure project so all members are part of the root namespace.
• Move type delcarations to retryhttp._types.
• Enable bare decorator syntax for retryhttp.retry (i.e., @retry works as well as @retry())