Here are steps how to set it up :
1. Click on the project name in left side panel
2. Go to TARGETS and select your base project
3. Click on build phases tab on the top right side
Part of Xcode will look like this
Copy this entire script in the provided blank space.
buildNumber=$(/usr/libexec/PlistBuddy -c "Print CFBundleVersion" "${PROJECT_DIR}/${INFOPLIST_FILE}")
buildNumber=$(($buildNumber + 1))
/usr/libexec/PlistBuddy -c "Set :CFBundleVersion $buildNumber" "${PROJECT_DIR}/${INFOPLIST_FILE}"
