[README] XCTest has type safety like Numble

    func XCTAssertEqual<T : Equatable>(expression1: @autoclosure () -> [T], expression2: @autoclosure () -> [T], _ message: String = default, file: String = default, line: UInt = default)
Merge pull request #73 from kylef/patch-1

[README] XCTest has type safety like Nimble