Upgrade to Flow v0.98

Summary:
https://our.intern.facebook.com/intern/wiki/Flow/Flow_Release_Process/#update-xplat-js

allow-large-files

Reviewed By: avikchaudhuri

Differential Revision: D15149545

fbshipit-source-id: 85b6107c058d50d9fe80fd277fcdd005faccea8e

Libraries/Components/ScrollView/ScrollView.js

@@ -674,6 +674,9 @@ class ScrollView extends React.Component<Props, State> {
       this.props.contentOffset ? this.props.contentOffset.y : 0,
     );
     this._scrollAnimatedValue.setOffset(
+      /* $FlowFixMe(>=0.98.0 site=react_native_fb) This comment suppresses an
+       * error found when Flow v0.98 was deployed. To see the error delete this
+       * comment and run Flow. */
       this.props.contentInset ? this.props.contentInset.top : 0,
     );
     this._stickyHeaderRefs = new Map();