when using the 'username-taget secret' option, the supplied
regex 'username-pattern' will only scan the first line of the
secret file.
you could specify a username-pattern with '\n', but this will
break if the position of the username is not consistent.
this change will implement re.search and the re.MULTILINE
option to search every line in a secrect file.
example:
--secret file
my_secret_password
username: my_username
--secret file
spawn --userscript qute-pass --username-target secret --username-pattern "^username: (.*)"
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