Update CircleProgressView.swift
Update CircleProgressView.swift

Addressed an issue when using in cocoapods in swift projects.
CardinalNow/iOS-CircleProgressView,datomnurdin/iOS-CircleProgressView,mosesoak/iOS-CircleProgressView,datomnurdin/iOS-CircleProgressView,mosesoak/iOS-CircleProgressView,CardinalNow/iOS-CircleProgressView,CardinalNow/iOS-CircleProgressView