To reproduce:

1. Open the project, attached by the tester (polygonColliderAutoUpdate.zip)
2. Open the Sprite Editor for the Polygon sprite
3. Edit Physics Shape of the sprite in the Sprite Editor and hit Apply
4. Observe that PolygonCollider stays the same

Expected: Polygon Collider updates its shape as soon as the Physics Shape of the sprite is changed

Reproduced in 2017.1.2p1, 2017.2.0f3, 2017.3.0b5