4095 [in_app_purchase]IAP/android add cancel status (cla: yes, waiting for tree to go green, p: in_app_purchase, platform-android)

4097 [in_app_purchase]Update the version number and CHANGELOG (cla: yes, waiting for tree to go green, p: in_app_purchase)

4458 [in_app_purchase] Add support for promotional offers through Store-Kit wrappers (cla: yes, waiting for tree to go green, p: in_app_purchase, platform-ios)

4471 [in_app_purchase] add pedantic as a dependency to in_app_purchase plugins (cla: yes, p: in_app_purchase, platform-ios, platform-android)