docs(README): add FAQ "Does this work with substack/tape?"

Author: twada

Diff for: README.md

@@ -132,6 +132,7 @@ FAQ
 ---------------------------------------
 
 - [Support other assertion styles?](https://github.com/power-assert-js/power-assert/issues/22)
+- [Does this work with substack/tape?](https://github.com/power-assert-js/power-assert/issues/30)
 - [Are all dependencies required at runtime?](https://github.com/power-assert-js/power-assert/issues/24)
 - [Descriptive assertion message does not appear when writing tests in ES6 with Babel](https://github.com/power-assert-js/webpack-espower-loader/issues/4#issuecomment-139605343)