updates Helpshift pod to 4.5.0
Merge pull request #1864 from wordpress-mobile/issue/1845-update_Helpshift_framework

issue #1845 - update Helpshift framework
Merge remote-tracking branch 'origin/develop' into issue/1861-upgrades-afnetworking

Conflicts:
	Pods/Pods.xcodeproj/project.pbxproj