InvalidOp exception when a 'step' function has the same parameter name as Example name #257

e.g. when i have

var examples = new ExampleTable("Resource", "Existing");

this
                .Given(_ => _.GivenThereIsOnly__existing__ResourceInDatabase(Existing))
                .When(...)
                .Then(...)
                .WithExamples(examples)

if my step function as following:

public async Task GivenThereIsOnly__existing__ResourceInDatabase(TResource resource)

Then name of parameter 'resource' of method 'GivenThereIsOnly__existing__ResourceInDatabase' will conflict with example name 'Resource' in FluentScanner and will result in following:

System.InvalidOperationException occurred
HResult=0x80131509
Message=Sequence contains more than one matching element
Source=
StackTrace:
at System.Linq.Enumerable.SingleOrDefault[TSource](IEnumerable1 source, Func2 predicate)
at TestStack.BDDfy.FluentScanner1.<CreateTitle>b__16_3(<>f__AnonymousType02 i)
at System.Linq.Enumerable.SelectEnumerableIterator2.MoveNext() at System.Collections.Generic.EnumerableHelpers.ToArray[T](IEnumerable1 source, Int32& length)
at System.Collections.Generic.EnumerableHelpers.ToArray[T](IEnumerable1 source) at System.Linq.Enumerable.ToArray[TSource](IEnumerable1 source)
at TestStack.BDDfy.FluentScanner1.<>c__DisplayClass16_0.<CreateTitle>b__0() at TestStack.BDDfy.StepTitle.ToString() at TestStack.BDDfy.Step.get_Title() at TestStack.BDDfy.Reporters.TextReporter.GetStepWithLines(Step s) at System.Linq.Enumerable.SelectEnumerableIterator2.MoveNext()
at System.Collections.Generic.List1..ctor(IEnumerable1 collection)
at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
at TestStack.BDDfy.Reporters.TextReporter.Process(Story story)
at TestStack.BDDfy.Engine.Run()
at TestStack.BDDfy.BDDfyExtensions.BDDfy[TStory](Object testObject, String scenarioTitle, String caller)
at ...

Would be good to add a sort of clearer message to CreateTitle method of FluentScanner