* Adding the Session-Username header to the /api/verify endpoint when using cookie auth will check the value stored in the session store for the username and the header value are the same.
* use strings.EqualFold to compare case insensitively
* add docs
* add unit tests
* invalidate session if it is theoretically hijacked and log it as a warning (can only be determined if the header doesn't match the cookie)
* add example PAM script
* go mod tidy
* go mod bump to 1.15
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