Prepare 0.0.10 release

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To release join/v0.4 for API schema in Router, and a bunch of stuff for QP in Router.

Features

• Query plan changes for initial router integration, by SimonSapin in pull/240
• Mark join/v0.4 spec as supported for non-query planning purpose, by SimonSapin in pull/233, pull/237
• Continued work on core query planning implementation, by duckki, SimonSapin, TylerBloom

Maintenance

• Update apollo-compiler, by goto-bus-stop in pull/253

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"continued implementation" includes everything where I didn't come up with a line that would also be meaningful to external onlookers immediately 😅