infra-sk - Update README.md regarding module resolution.
infra-sk - Update README.md regarding module resolution.

Change-Id: I7952404f8a5826e13b442e6a0915aa580be26710
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/240179
Commit-Queue: Joe Gregorio <b9cf2471ff6d33504cafe8e6f356b732b2cadced@google.com>
Reviewed-by: Kevin Lubick <7cdab2cfab351f23814786ba39716e90eed69047@google.com>

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot