Merge pull request #680 from andrei-datcu/patch-1

Use constant references when iterating over ranges in replace_range

include/sqlite_orm/sqlite_orm.h

@@ -12358,7 +12358,7 @@ namespace sqlite_orm {
                 auto stmt = statement.stmt;
                 sqlite3_reset(stmt);
                 for(auto it = statement.t.range.first; it != statement.t.range.second; ++it) {
-                    auto &o = *it;
+                    const auto &o = *it;
                     tImpl.table.for_each_column([&o, &index, &stmt, db](auto &c) {
                         using column_type = typename std::decay<decltype(c)>::type;
                         using field_type = typename column_type::field_type;