Update cheatsheet.md: Adding Lambda correction.

Currently, the example where a lambda function was added to chaiscript didn't work for me.
I use g++7, g++8,g++9 both with c++14 and c++17 mode.
It doesn't work either in clang++-7.

If the lambda is wrapped into a std::function<> it will work again!
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medithe 2019-04-25 23:18:51 +02:00 committed by GitHub
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@ -66,7 +66,7 @@ chai.add(chaiscript::fun(static_cast<int(Derived::*)>(&Derived::data)), "data");
```
chai.add(
chaiscript::fun<std::string (bool)>(
chaiscript::fun<std::function<std::string (bool)>>(
[](bool type) {
if (type) { return "x"; }
else { return "y"; }