README: Fix string representation of dumped json

As is it's confusing and inconsistent with the indented form right below. The backslash escapes make it confusing.
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Alexander “weej” Jones 2020-03-10 19:37:20 +00:00 committed by GitHub
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commit 5fdb1d08aa
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@ -311,7 +311,7 @@ You can also get a string representation of a JSON value (serialize):
```cpp
// explicit conversion to string
std::string s = j.dump(); // {\"happy\":true,\"pi\":3.141}
std::string s = j.dump(); // {"happy":true,"pi":3.141}
// serialization with pretty printing
// pass in the amount of spaces to indent