Add deprecation warning to AccessibilityInfo.fetch

Summary: This was already deprecated, but without a message.

Reviewed By: zackargyle, ejanzer

Differential Revision: D17180347

fbshipit-source-id: 44aa5d1821e56f7600033e82062c4661fe663471

Author: elicwhite

Libraries/Components/AccessibilityInfo/AccessibilityInfo.android.js

@@ -91,6 +91,9 @@ const AccessibilityInfo = {
    * Same as `isScreenReaderEnabled`
    */
   get fetch(): () => Promise<boolean> {
+    console.warn(
+      'AccessibilityInfo.fetch is deprecated, call Accessibility.isScreenReaderEnabled instead',
+    );
     return this.isScreenReaderEnabled;
   },
 

Libraries/Components/AccessibilityInfo/AccessibilityInfo.ios.js

@@ -165,6 +165,9 @@ const AccessibilityInfo = {
    * Same as `isScreenReaderEnabled`
    */
   get fetch(): $FlowFixMe {
+    console.warn(
+      'AccessibilityInfo.fetch is deprecated, call Accessibility.isScreenReaderEnabled instead',
+    );
     return this.isScreenReaderEnabled;
   },