Reword README.md

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@ -193,8 +193,8 @@ therefore, `-o false` does not work.
## `std::vector<T>` values
Parsing of list of values in form of a `std::vector<T>` is also supported, as long as `T`
can be parsed. To separate single values in a list the definition `CXXOPTS_VECTOR_DELIMITER`
Parsing a list of values into a `std::vector<T>` is also supported, as long as `T`
can be parsed. To separate single values in a list the define `CXXOPTS_VECTOR_DELIMITER`
is used, which is ',' by default. Ensure that you use no whitespaces between values because
those would be interpreted as the next command line option. Example for a command line option
that can be parsed as a `std::vector<double>`: