revise tintColors

Author: sgny

src/ReactNativeCheckbox.re

@@ -4,7 +4,7 @@ open ReactNative;
 type tintColors;
 [@bs.obj]
 external tintColors:
-  (~true_: Color.t=?, ~false_: Color.t=?, unit) => tintColors =
+  (~_true: Color.t=?, ~_false: Color.t=?, unit) => tintColors =
   "";
 
 type checkBoxEvent =
@@ -98,4 +98,4 @@ external make:
     ~testID: string=?
   ) =>
   React.element =
-  "@react-native-community/checkbox";
+  "@react-native-community/checkbox";