fix style issues

Author: cmcewen

React/Views/RCTTabBar.h

@@ -13,8 +13,8 @@
 
 @interface RCTTabBar : UIView
 
-@property (nonatomic, copy) UIColor *tintColor;
-@property (nonatomic, copy) UIColor *barTintColor;
+@property (nonatomic, strong) UIColor *tintColor;
+@property (nonatomic, strong) UIColor *barTintColor;
 
 - (instancetype)initWithEventDispatcher:(RCTEventDispatcher *)eventDispatcher NS_DESIGNATED_INITIALIZER;
 

React/Views/RCTTabBar.m

@@ -132,11 +132,13 @@ - (void)reactBridgeDidFinishTransaction
   }];
 }
 
-- (void)setBarTintColor:(UIColor *)barTintColor {
+- (void)setBarTintColor:(UIColor *)barTintColor 
+{
   _tabController.tabBar.barTintColor = barTintColor;
 }
 
-- (void)setTintColor:(UIColor *)tintColor {
+- (void)setTintColor:(UIColor *)tintColor 
+{
   _tabController.tabBar.tintColor = tintColor;
 }