Merge pull request #1454 from onedebos/patch-1

jest.md

@@ -93,6 +93,15 @@ it.skip(···) // alias: xit()
 
 See: [test.skip](http://facebook.github.io/jest/docs/en/api.html#testskipname-fn)
 
+
+### Optional flags
+
+| Flag                  | Description                              |
+| --------------------- | ---------------------------------------- |
+| `--coverage`          | See a summary of test coverage           |
+| `--detectOpenHandles` | See a summary of ports that didn't close |
+| `--runInBand`         | Run all tests one after the other        |
+
 Expect
 ------
 {: .-three-column}