message: scripts: Update NuGet package spec
  Migrate from licenseUrl to license since licenseUrl is deprecated and
  fix grammar for VS version list.
diff: <authors>Arseny Kapoulkine</authors>
  <owners>Arseny Kapoulkine</owners>
  <requireLicenseAcceptance>false</requireLicenseAcceptance>
  - <licenseUrl>https://pugixml.org/license.html</licenseUrl>
  + <license type="expression">MIT</license>
  <projectUrl>https://pugixml.org/</projectUrl>
  <iconUrl>https://github.com/zeux/pugixml/logo.svg</iconUrl>
  <description>pugixml is a C++ XML processing library, which consists of a DOM-like interface with rich traversal/modification capabilities, an extremely fast XML parser which constructs the DOM tree from an XML file/buffer, and an XPath 1.0 implementation for complex data-driven tree queries. Full Unicode support is also available, with Unicode interface variants and conversions between different Unicode encodings (which happen automatically during parsing/saving).
  pugixml is used by a lot of projects, both open-source and proprietary, for performance and easy-to-use interface.
  -This package contains builds for VS2013, VS2015 and VS2017, VS2019, for both statically linked and DLL CRT; you can switch the CRT linkage in Project -> Properties -> Referenced Packages -> pugixml.</description>
  +This package contains builds for VS2013, VS2015, VS2017 and VS2019, for both statically linked and DLL CRT; you can switch the CRT linkage in Project -> Properties -> Referenced Packages -> pugixml.</description>
  <summary>Light-weight, simple and fast XML parser for C++ with XPath support</summary>
  <releaseNotes>https://pugixml.org/docs/manual.html#changes</releaseNotes>
  <copyright>Copyright (c) 2006-2019 Arseny Kapoulkine</copyright>
  