Crash on Linux.
Hi, I try to use Norm on Linux but I have a crash that says it can't open the database : 
```
/mnt/c/Users/USER/Documents/.../server/src/server.nim(31) server
/mnt/c/Users/USER/Documents/.../server/src/server.nim(20) main2
/mnt/c/Users/USER/Documents/.../server/src/database/db.nim(26) seedDb
/mnt/c/Users/USER/Documents/.../server/src/database/conn.nim(10) initConnectionPool
/mnt/c/Users/USER/Documents/.../server/nimbledeps/pkgs2/norm-2.8.1-2d2318da204033dfb6532590aaccd7b40d2c4e80/norm/pool.nim(41) newPool
/mnt/c/Users/USER/Documents/.../server/nimbledeps/pkgs2/norm-2.8.1-2d2318da204033dfb6532590aaccd7b40d2c4e80/norm/pool.nim(31) :anonymous
/mnt/c/Users/USER/Documents/.../server/src/database/conn.nim :anonymous
/mnt/c/Users/USER/Documents/.../server/nimbledeps/pkgs2/lowdb-0.2.1-e26a392547b826d7d3e6566dc0fd76e9f42ead06/lowdb/sqlite.nim(517) open
/mnt/c/Users/USER/Documents/.../server/nimbledeps/pkgs2/lowdb-0.2.1-e26a392547b826d7d3e6566dc0fd76e9f42ead06/lowdb/sqlite.nim(143) dbError
Error: unhandled exception: unable to open database file [DbError]
```

I tried with permissions 777, I tried to run as SUDO, as ROOT, nothing works.

According to the traceback, the lower level I have control on is this proc : 
```
proc initConnectionPool*(databasePath: string, size: int) =
  {.cast(gcsafe).}:
    SQLITE_POOL = newPool[DbConn](
      size, 
      () => open(databasePath, "", "", ""), 
      pepExtend
    )

    debug fmt"Created pool with '{$size}' connections to '{databasePath}'"
```

Is it a problem with Norm? Or did I do something not right?
SQLite 3 is also installed on my Linux system. My system is the latest Debian.