Inherit std exception for CppSQLite3Exception (#14)

add noexcept and change to return cstr

Author: EmosewaMC

CppSQLite3.h

@@ -11,6 +11,7 @@
 #include <sqlite3.h>
 #include <cstdio>
 #include <cstring>
+#include <exception>
 
 #define CPPSQLITE_ERROR 1000
 
@@ -59,7 +60,7 @@ namespace detail
 }
 
 
-class CppSQLite3Exception
+class CppSQLite3Exception : public std::exception
 {
 public:
 
@@ -75,6 +76,8 @@ class CppSQLite3Exception
 
     const char* errorMessage() const { return mpszErrMess; }
 
+    const char* what() const noexcept override { return mpszErrMess; }
+
     static const char* errorCodeAsString(int nErrCode);
 
 private: