Fixed an issue with WebView2 when changelog has linked files and basi…

…c authentication is enabled (ravibpatel#537)

Changed WebView2 size to same size as WebBrowser control.

Updated appveyor.yml.

Treat empty ContentDisposition header as null. (ravibpatel#468)

Updated version to 1.6.4.

Updated version to v1.6.3.

Updated version to v1.6.2 in nuspec file.

Updated NuGet api_key in appveyor.yml.

Fixed an issue where UpdateForm was shown without visual styles when …

…it is used from CheckForUpdateEvent event and in WPF app.

Fixed an XML external entity (XXE) vulnerability.