UserAgentTests Failure - It_should_default_to_the_library_version 

AssemblyInfo.cs was [bumped](https://github.com/darrencauthon/csharp-sparkpost/commit/a907c8c5445a1c32c0ecbd226fccdefa6dad9afd#diff-7f9fb7097a976a080a171e712d21801c) to the next version but [UserAgentTests.cs](https://github.com/darrencauthon/csharp-sparkpost/blob/master/src/SparkPost.Tests/ClientTests.cs#L78) was not updated to reflect the version change.