RelNotes: mention "sha1dc: optionally use sha1collisiondetection as a submodule"

To note that merely cloning git.git without --recurse-submodules doesn't get you a full copy of the code anymore. See 5f6482d642 ("RelNotes: mention "log: make --regexp-ignore-case work with --perl-regexp"", 2017-07-20). Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>

Ævar Arnfjörð Bjarmason committed Jul 20, 2017 at 14:19 UTC b7ef54f273bb9d7e49cb5f6b4cd1d7f552434fe1
1 file changed +5
Documentation/RelNotes/2.14.0.txt
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@@ -235,6 +235,11 @@ Performance, Internal Implementation, Development Support etc.
235 behaviour of the comparison function can be specified at the time a
236 hashmap is initialized.
237
238 + * The "collision detecting" SHA-1 implementation shipped with 2.13 is
239 + now integrated into git.git as a submodule (the first submodule to
240 + ship with git.git). Clone git.git with --recurse-submodules to get
241 + it. For now a non-submodule copy of the same code is also shipped
242 + as part of the tree.
243
244 Also contains various documentation updates and code clean-ups.
245