upgrade to flow 0.122.0

Reviewed By: samwgoldman

Differential Revision: D20910409

fbshipit-source-id: 500d967cc72527d5a615a465a0651b451b045a53

Author: mroch

src/model/encoding/__tests__/convertFromHTMLToContentBlocks-test.js

@@ -76,6 +76,9 @@ beforeEach(() => {
 });
 
 const convertFromHTML = (html_string, config) => {
+  /* $FlowFixMe(>=0.122.0 site=www) This comment suppresses an error found when
+   * Flow v0.122.0 was deployed. To see the error, delete this comment and run
+   * Flow. */
   const options = {
     ...DEFAULT_CONFIG,
     /* $FlowFixMe(>=0.111.0) This comment suppresses an error found when Flow