Display boolean arguments in exception messages as true/false instead of 1/empty string

Right now, when a method without an expectation is called like `$object->methodNameHere(false)`, then exception with following message will be thrown (see below). Notice `methodNameHere("")` part, which tells, that an empty string was given as input, however this was `false`.

`Mockery\Exception\NoMatchingExpectationException : No matching handler found for ClassNameHere::methodNameHere(""). Either the method was unexpected or its arguments matched no expected argument list for this method`

After fixing message would look like:
`Mockery\Exception\NoMatchingExpectationException : No matching handler found for ClassNameHere::methodNameHere(false). Either the method was unexpected or its arguments matched no expected argument list for this method`