Updated pod spec

Amends wording on upload screen

IOS-27: Fixes issue when switching environments

Updates podspec version

Updates change log

Amends light mode string

Updates build number to 73

Forces light mode

IOS-27: Fixes crash when tapping on a page

IOS-28: Fixes stories tab not appearing in iOS 13

IOS-27: Removes UT for PayPal

Updates build number to 72

IOS-27: Updates all pods

IOS-27: Amends checkout to use the newest Stripe version

IOS-27: Updates circle ci config