[data-shapes] new commits pushed by nicholascar

The following commits were just pushed by nicholascar to https://github.com/w3c/data-shapes:

* update README to better list previous & current docs
  by Nicholas Car
https://github.com/w3c/data-shapes/commit/1074694a55a22e57ba21ed289a2d078da03683b4

* Merge pull request #375 from w3c/readme-update

Update README to better list previous & current docs
  by Nicholas Car
https://github.com/w3c/data-shapes/commit/a0a79ea3fb4f3981cb3fb042a55340f9f545721b



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