load job config allow quoted newlines

[jwBoral]

https://github.com/pydata/pandas-gbq/blob/master/pandas_gbq/load.py

needs to add the condition

job_config.allow_quoted_newlines = True

current work around is:
df = df.replace({'\n': ' ', '\r\n': ' ', '\r': ' '}, regex=True)

[max-sixty]

PR welcome!

Is there a time you wouldn't accept quoted newlines in config? i.e. does this need to be a parameter?

[tswast]

I think we could safely always turn this option on. I see the fact that we serialize to CSV as an implementation detail.

[tswast]

Closed by #230