Mark RepositoryFormatException.GetObjectData with System.Security.SecurityCritical

[khellang]

I'm getting this exception when trying to run a program using Octokit in .NET Fiddle:

[System.TypeLoadException: Inheritance security rules violated while overriding member: 'Octokit.RepositoryFormatException.GetObjectData(System.Runtime.Serialization.SerializationInfo, System.Runtime.Serialization.StreamingContext)'. Security accessibility of the overriding method must match the security accessibility of the method being overriden.]
at Program.d__5.MoveNext(): line 57

[System.AggregateException: One or more errors occurred.]
at Program.Main(String[] args): line 16

I think RepositoryFormatException.GetObjectData should be annotated with System.Security.SecurityCritical, like its base version.

I'll PR this if no one beats me to it 😄

[M-Zuber]

Beat you to it 😃