Update daily.py

I've changed the default interval to `"1d"` instead of `"d"` as Yahoo must have changed their API in the last couple of weeks. With the proposed change, I was able to get the data from Yahoo's Finance API.

Author: s-meinhardt

pandas_datareader/yahoo/daily.py

@@ -63,7 +63,7 @@ def __init__(
         adjust_price=False,
         ret_index=False,
         chunksize=1,
-        interval="d",
+        interval="1d",
         get_actions=False,
         adjust_dividends=True,
     ):