Merge pull request #351 from kishikawakatsumi/objc_infer

Remove SWIFT_SWIFT3_OBJC_INFERENCE

Lib/Configurations/Base.xcconfig

@@ -44,5 +44,4 @@ WATCHOS_DEPLOYMENT_TARGET = 2.0;
 TVOS_DEPLOYMENT_TARGET = 9.0;
 MACOSX_DEPLOYMENT_TARGET = 10.9;
 
-SWIFT_SWIFT3_OBJC_INFERENCE = On;
 SWIFT_VERSION = 4.0;