chore: up verssion to 2.1.0

Author: phnx47

src/Unidecode.NET.csproj

@@ -9,7 +9,7 @@
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <Description>Unidecode.NET returns transliterated string</Description>
     <TargetFrameworks>netstandard1.2;netstandard2.0;netstandard2.1</TargetFrameworks>
-    <VersionPrefix>2.0.0</VersionPrefix>
+    <VersionPrefix>2.1.0</VersionPrefix>
     <PackageTags>text;unicode;seo</PackageTags>
     <RepositoryType>git</RepositoryType>
     <PackageProjectUrl>https://github.com/thecoderok/Unidecode.NET</PackageProjectUrl>