getCurrentConnectivity should resolve with object

Summary:`getCurrentConnectivity()` should resolve with object instead of array otherwise in `NetInfo.fetch().done(reach => console.log('Initial: ' + reach))` `reach` will be undefined (see https://github.com/l-urence/react-native/blob/master/Libraries/Network/NetInfo.js#L200).

cc satya164
Closes #6373

Differential Revision: D3032773

fb-gh-sync-id: edc545548d3c17387545b6c59894c27e4563cb18
shipit-source-id: edc545548d3c17387545b6c59894c27e4563cb18

Libraries/Network/RCTNetInfo.m

@@ -90,7 +90,7 @@ - (void)dealloc
 RCT_EXPORT_METHOD(getCurrentConnectivity:(RCTPromiseResolveBlock)resolve
                   reject:(__unused RCTPromiseRejectBlock)reject)
 {
-  resolve(@[@{@"network_info": _status}]);
+  resolve(@{@"network_info": _status});
 }
 
 @end