Recording std::string parameters on spys

[exeba]

When I run the following code, I would expect the test to pass:

#include <iostream>
#include <string>

#define CATCH_CONFIG_MAIN 
#include "catch.hpp"
#include "fakeit.hpp"

class SomeClass {
    public:
        virtual ~SomeClass() {}

        virtual void do_something(int a, std::string b) {
            std::cout << "Called with: " << a << ", " << b << "\n";
        }
};

TEST_CASE("Spy on strings") {
    SomeClass test;
    fakeit::Mock<SomeClass> testSpy(test);
    fakeit::Spy(Method(testSpy, do_something));

    testSpy.get().do_something(2, "some_string");

    fakeit::Verify(Method(testSpy, do_something).Using(2, "some_string"));
}

What I get instead is the following error:

Called with: 2, some_string

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
a.out is a Catch v2.10.2 host application.
Run with -? for options

-------------------------------------------------------------------------------
Spy on strings
-------------------------------------------------------------------------------
test_case.cpp:18
...............................................................................

test_case.cpp:28: FAILED:
  Verify( testSpy.do_something(2, some_string) )
with message:
  test_case.cpp:28: Verification error
  Expected pattern: testSpy.do_something(2, some_string)
  Expected matches: at least 1
  Actual matches  : 0
  Actual sequence : total of 1 actual invocations:
    testSpy.do_something(2, )

===============================================================================
test cases: 1 | 1 failed
assertions: 1 | 1 failed

[FranckRJ]

Should be fixed with #272.