Add missing dependency to canvas-rce
Add missing dependency to canvas-rce

closes MAT-103
flag=none

test plan:
  - canvas-lms builds and yarn.lock does not change.
    basically, if it passes jenkins, we're good.

Change-Id: Icee90eb015175c4fef863a6c05dd29b089c45a88
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/264048
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>
Reviewed-by: Nate Armstrong <619b324efbf5f7848de055bdc8bef4c0dd7c8ef5@instructure.com>
QA-Review: Nate Armstrong <619b324efbf5f7848de055bdc8bef4c0dd7c8ef5@instructure.com>
Product-Review: Ed Schiebel <0ca8a83847a5889cf05cb219c0ab09f6b646243b@instructure.com>

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