Update csproj version to 3.0.0. (ArangoDB-Community#489)

Co-authored-by: Ross Mills <rmills@actify.com>

Author: rossmills99

arangodb-net-standard/ArangoDBNetStandard.csproj

@@ -8,7 +8,7 @@
     <PackageProjectUrl>https://github.com/ArangoDB-Community/arangodb-net-standard</PackageProjectUrl>
     <RepositoryUrl>https://github.com/ArangoDB-Community/arangodb-net-standard</RepositoryUrl>
     <PackageTags>arangodb-net-standard arangodb arango .net c# netstandard multimodel graph document database</PackageTags>
-    <Version>2.0.1</Version>
+    <Version>3.0.0</Version>
     <Company>ArangoDB Community</Company>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <Authors>ArangoDB Community</Authors>