Bump libgit2 to b31b2360044f5960d52b7b12d1c9e48cd647a3fb

Edward Thomson · Edward Thomson · commit 4471a73f8204 · 2017-03-07T12:12:30.000Z
diff --git a/vendor/libgit2 b/vendor/libgit2
@@ -1 +1 @@
-Subproject commit 45d55797b661085f7f5385d748d930a5148160cd
+Subproject commit b31b2360044f5960d52b7b12d1c9e48cd647a3fb
