1.3-preview1

Remove support for .Net Core 2.2 and add support for .Net Core 3.0/3.1

Changes:

• d48a3ad Update nuspec file
• 308b458 Update azure-pipelines.yml
• 739f0a5 Remove support for .Net Core 2.2 and add support for .Net Core 3.0/3.1 (#76) [ #64, #65 ]
• a49c729 Update npm packages
• cc6f8e9 Update to gulp 4.x (#75)

This list of changes was auto generated.