Merge pull request #9 from paulhise1/master

Add small change explanation text to README

updated pod specs to version 3.2.3

updated pod specs to version 3.2.2

specify Swift 4.0 in podspecs

updated podspecs to version 3.2

updated podspecs to 3.1.1

updated podspecs' to 3.1

updated README.md by changing StaticFunction to ClassFunction

changed recorded calls storage from a dictionary to an array, minor c…

…lean up

update podspec's versions to 2.2.4