chore(deps): upgrading @readme/oas-tooling to fix a flattenSchema bug

[erunion]

🧰 What's being changed?

Upgrades @readme/oas-tooling to 3.6.1 to resolve a bug in how we'd flatten allOf, oneOf, and anyOf schemas in responses.

🧪 Testing

You can see this bug in the wild here: http://bin.readme.com/s/5f8782ef410c3700243caa55

Despite the response having an application property that's an allOf, it's not parsed:

With this change however:

📖 Release Notes

3.6.1 (2020-10-14)

• fix: flattenSchema not properly flattening allOf/oneOf/anyOf schemas (Bump css-loader from 1.0.0 to 3.2.0 #288) (5050abe), closes #288
• chore(deps-dev): bump @readme/eslint-config from 3.5.0 to 3.6.0 (Bump webpack from 3.10.0 to 3.12.0 #284) (c8705cb), closes #284
• chore(deps-dev): bump eslint from 7.10.0 to 7.11.0 (Bump react-dom from 16.8.6 to 16.9.0 #285) (09bd4f2), closes #285
• chore(deps-dev): bump jest from 26.4.2 to 26.5.3 (Bump codemirror from 5.48.2 to 5.48.4 #286) (e7c68a6), closes #286
• chore(deps-dev): bump sinon from 9.1.0 to 9.2.0 ([Security] Bump acorn from 6.2.1 to 7.0.0 #287) (20fa17f), closes #287