Prepare for 3.0.0

Author: oschwald

MaxMind.Db/MaxMind.Db.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <Description>.NET reader for the MaxMind DB file format</Description>
-    <VersionPrefix>2.6.1</VersionPrefix>
+    <VersionPrefix>3.0.0</VersionPrefix>
     <TargetFrameworks Condition=" '$(OS)' == 'Windows_NT' ">net461;net5.0;netstandard2.0;netstandard2.1</TargetFrameworks>
     <TargetFrameworks Condition=" '$(OS)' != 'Windows_NT' ">net5.0;netstandard2.0;netstandard2.1</TargetFrameworks>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>