Set minimum deployment target to 8.0 (#632)

config/Project-Shared.xcconfig

@@ -448,7 +448,7 @@ GCC_WARN_UNUSED_LABEL = YES
 GCC_WARN_UNUSED_VARIABLE = YES
 
 
-IPHONEOS_DEPLOYMENT_TARGET = 9.0
+IPHONEOS_DEPLOYMENT_TARGET = 8.0