Unable to execute multiple lines of MySQL commands

**Describe the bug**
Syntax error when I trying to execute multiple lines of MySQL commands.
```
libc++abi.dylib: terminating with uncaught exception of type drogon::orm::SqlError: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'SHOW TABLES' at line 2
```
**To Reproduce**
```c++
auto cli = drogon::orm::DbClient::newMysqlClient("blahblah");
cli->execSqlSync(R"EOF(
SHOW TABLES;
SHOW TABLES;
)EOF");
```

**Expected behavior**
SQL command executed without error or the framework could provide another multi line SQL interface.

**Screenshots**
NA

**Desktop (please complete the following information):**
NA

**Smartphone (please complete the following information):**
NA

**Additional context**
```
% mysql --version
mysql Ver 8.0.19 for osx10.15 on x86_64 (Homebrew)
```
Dragon v1.1.0 release