Change exception data member

Dani-Hub · cdunn2001 · commit f9feb66be265 · 2015-03-09T18:42:16.000-05:00
from "reference to string" to "string" (Resolves the most serious part of issue open-source-parsers#216)
diff --git a/src/lib_json/json_value.cpp b/src/lib_json/json_value.cpp
@@ -158,7 +158,7 @@ class JSON_API Exception : public std::exception {
   virtual ~Exception() throw();
   virtual char const* what() const throw();
 protected:
-  std::string const& msg_;
+  std::string const msg_;
 };
 class JSON_API RuntimeError : public Exception {
 public:
