Upgrade to 1.9.1

Summary:
This upgrades prettier to 1.9.1.

The next diffs will be codemods to upgrade.

bypass-lint
drop-conflicts

Generated by following instructions here:
https://our.intern.facebook.com/intern/dex/prettier/upgrade-guide/

As well as the excellent instructions in the previous diff: D5763293

Reviewed By: vjeux

Differential Revision: D6497877

fbshipit-source-id: 3b88b96e375ddf1fbe039a0593569bbdde40a2dc

Author: adamjernst

Inspector/.eslintrc

@@ -251,7 +251,6 @@
 
     "flowtype/define-flow-type": 1,
     "flowtype/use-flow-type": 1,
-    "flowtype/object-type-delimiter": [1, "comma"],
 
   // React Plugin
   // The following rules are made available via `eslint-plugin-react`.