Added failing test for the PhoneNumberFilter, proving it doesn't work because replacement isn't done in place, but returned as a new string instance.
Added failing test for the PhoneNumberFilter, proving it doesn't work because replacement isn't done in place, but returned as a new string instance.

getsentry/raven-csharp,getsentry/raven-csharp,getsentry/raven-csharp,xpicio/raven-csharp,asbjornu/raven-csharp,webaction/raven-csharp,xpicio/raven-csharp