narrowing flow definition for style prop: Object -> CSSStyleDeclaration (react-grid-layout#716)

Author: Jabher

lib/GridItem.jsx

@@ -43,7 +43,7 @@ type Props = {
   usePercentages?: boolean,
 
   className: string,
-  style?: Object,
+  style?: CSSStyleDeclaration,
   // Draggability
   cancel: string,
   handle: string,

lib/ReactGridLayout.jsx

@@ -43,7 +43,7 @@ type State = {
 
 export type Props = {
   className: string,
-  style: Object,
+  style: CSSStyleDeclaration,
   width: number,
   autoSize: boolean,
   cols: number,

lib/components/WidthProvider.jsx

@@ -7,7 +7,7 @@ import type { ComponentType as ReactComponentType } from "react";
 type WPProps = {
   className?: string,
   measureBeforeMount: boolean,
-  style?: Object
+  style?: CSSStyleDeclaration
 };
 
 type WPState = {