Increase project version to 2.0.0-beta.1

Author: YevgeniyShunevych

src/Atata.Cli.HtmlValidate/Atata.Cli.HtmlValidate.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <TargetFramework>netstandard2.0</TargetFramework>
-    <Version>1.4.0</Version>
+    <Version>2.0.0-beta.1</Version>
     <Description>.NET library that provides an API for html-validate NPM package.
 
 The package targets .NET Standard 2.0, which supports .NET 5+, .NET Framework 4.6.1+ and .NET Core/Standard 2.0+.