README screenshot needs to be updated

[bryanenders]

The updated screenshot should use spec() instead of exampleGroups(). It should also display the updated fail message: failed - expected 'Click click click!', got 'Click!'. I think it should also use 4 space tabs since (1.) that‘s the standard in the project guidelines and (2.) that’s the Xcode default.

Here is the stab I took at it. I also made the decision to format the nested descriptions for sentence output. I.e., The initial describe is capitalized. The its end in periods.

[bryanenders]

@modocache Are you able to provide an updated screenshot? The current one is like an old comment in code: it’s rotten and it lies. If not, I’d recommend merging issue #78 as a stopgap until you are able to.