Unicode characters are not supported in Presto cursors

Hello,

It seems Unicode characters are not supported in cursors. When a Presto table has Unicode characters, UnicodeEncodeError error comes up during retrieval of cursor values. cp1252 encoding is applied. Is there any setting to apply utf-8 encoding?

**Error message**
```
Traceback (most recent call last):
File "C:\\Code\prestodb_stats.py", line 146, in
print(field)
File "C:\Program Files\Python36\lib\encodings\cp1252.py", line 19, in encode
return codecs.charmap_encode(input,self.errors,encoding_table)[0]
UnicodeEncodeError: 'charmap' codec can't encode character '\uffe5' in position 0: character maps to

```

**Code**
```python
conn = presto.connect(**con_config)
cur = conn.cursor()
cur.execute(sql_text)
rows = cur.fetchall()

for row in rows:
for field in row:
print(field)
```

For example, Unicode value is **￥**.

Thank you.