Update project description

Author: YevgeniyShunevych

README.md

@@ -57,10 +57,10 @@ Requires [html-validate](https://www.npmjs.com/package/html-validate) NPM packag
   new NpmCli()
       .InstallIfMissing(HtmlValidateCli.Name, global: true);
   ```
-- Using `HtmlValidateCli`:
+- Using its own `HtmlValidateCli` class:
   ```cs
   new HtmlValidateCli()
-      .RequireVersion("5.0.0");
+      .RequireVersion("5.1.1");
   ```
 
 ## Usage

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

@@ -7,7 +7,7 @@
 
 Targets .NET Standard 2.0.
 
-Requires html-validate (https://www.npmjs.com/package/html-validate) NPM package to be installed.</Description>
+Requires html-validate (https://www.npmjs.com/package/html-validate) NPM package to be installed, but can install itself.</Description>
     <RepositoryUrl>https://github.com/atata-framework/atata-cli-htmlvalidate</RepositoryUrl>
     <PackageId>Atata.Cli.HtmlValidate</PackageId>
     <PackageTags>atata cli api html-validate html validation</PackageTags>