No messages in output when using an array of strings as `exclude` in config file about stern HOT 1 CLOSED

Hi,

Thank you for reporting the issue.
I confirmed that Stern does not handle the exclude key in the config file properly if the value is an array as follows.

echo 'exclude: ["abcd"]' > /tmp/stern.config
STERNCONFIG=/tmp/stern.config stern --stdin -o raw <<EOF
abcd
a
b
c
d
e
f
xa
xb
xc
xd
xe
xf
EOF

In this case, Stern seems to wrongfully exclude lines that contain a, b, c, and d, even though it expects to exclude only lines with abcd.

e
f
xe
xf

from stern.