Version 2.0.0

Major refactoring nad optimizations thanks to contributions by @tinohager.
In order to migrate to the new version, you will need to rename your method calls to include the "Async" suffix and use `HostnameReceived` instead of `HostnameSpotted`.

Closes #5, #7

Certstream/Certstream.csproj

@@ -13,9 +13,9 @@
     <PackageReadmeFile>NuGet.md</PackageReadmeFile>
 
     <!--Version-->
-    <Version>1.2.2</Version>
-    <AssemblyVersion>1.2.2</AssemblyVersion>
-    <FileVersion>1.2.2</FileVersion>
+    <Version>2.0.0</Version>
+    <AssemblyVersion>2.0.0</AssemblyVersion>
+    <FileVersion>2.0.0</FileVersion>
 
     <!--Github-->
     <PackageProjectUrl>https://github.com/akacdev/Certstream</PackageProjectUrl>