MINOR: Commit .gitattributes

Commit .gitattributes to the repository to allow GitHub downloads to
properly fill in the SUBVERS and VERDATE files. It also prevents the
engineer in charge of the release to forget creating it when a new branch
is released.

see https://www.mail-archive.com/haproxy@formilux.org/msg38107.html

No functional change, may be backported everywhere.

(cherry picked from commit 78b9c54c666b88abd0c2a001ba23f420be29ea8c)
Signed-off-by: Willy Tarreau <w@1wt.eu>
(cherry picked from commit 43bf9ecea6864f90f227190682a1dc4355ef1fb0)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
(cherry picked from commit dfec580d5029e44bf1f07fa529d5a1131e17bded)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
1 file changed