v1.1.0 Added handles for envelope download

The following handles were added:

• GET /v2/envelope/{envelope_id}/certificate to download the certificate of completion
• GET /v2/envelope/{envelope_id}/signed_documents to download the envelope

See the API reference for more information

NuGet package: https://www.nuget.org/packages/Alohi.Signplus/1.1.0

Initial release

1.0.0

Fixing publish job