docs(README): add Conflicts with babel-plugin-istanbul?

Thanks to @ELLIOTTCABLE refs: power-assert-js/babel-preset-power-assert#4
power-assert-js · Jun 25, 2017 · d2dbce1 · d2dbce1
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diff --git a/README.md b/README.md
@@ -78,6 +78,7 @@ FAQ
 - [How to deal with `assert` calls in production](https://github.com/power-assert-js/power-assert/issues/43#issuecomment-208851919)
 - [Support JSX tags?](https://github.com/power-assert-js/power-assert/issues/34#issuecomment-269848058)
 - [Any tool to migrate `should/expect` code to `power-assert`?](https://github.com/power-assert-js/power-assert/issues/74)
+- [Conflicts with babel-plugin-istanbul?](https://github.com/power-assert-js/babel-preset-power-assert/issues/4)
 
 
 INSTALL