Update kernel.py

[lomanhei]

Support writting SQL with spaces or new lines.

Issue

Using the original version resulted an error: (pymysql.err.ProgrammingError) ... , 'Cancelled', 'Shipped') LIMIT 20 limit 1000], with the code below

   ...
    'Cancelled',
    'Shipped')
LIMIT
    20;

Cause

' limit ' not in l is not smart enough to detect '/n' or '/t' as separator.

...
if l.startswith('select ') and ' limit ' not in l:
...

Fix

Convert any '/n' or '/t' to ' '

...
l = l.replace('\t',' ').replace('\n',' ')
...