Update NimbleXCTestHandler.swift
Update NimbleXCTestHandler.swift

access level for record failure, which can be used in custom AssertionHandler class
phatblat/Nimble,twobitlabs/Nimble,Quick/Nimble,AnthonyMDev/Nimble,phatblat/Nimble,twobitlabs/Nimble,phatblat/Nimble,Quick/Nimble,Quick/Nimble,twobitlabs/Nimble,AnthonyMDev/Nimble,AnthonyMDev/Nimble