`not yet implemented: blobs not supported`

I think this is pretty self explanatory. :)

```bash
thread '<unnamed>' panicked at src/lib.rs:453:40:
not yet implemented: blobs not supported
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
Traceback (most recent call last):
rows = cur.fetchall()
pyo3_runtime.PanicException: not yet implemented: blobs not supported
```