add webp to lfs config

webp is a modern alternative to jpg, png and gif which is supported by all browsers

Author: coolya

buildbot-git-config

@@ -1,5 +1,5 @@
 [lfs]
-	fetchinclude = *.jpg,*.png,*.jpeg,*.svg,*.gif,*.pdf,*.mp4,*.bmp
+	fetchinclude = *.jpg,*.png,*.jpeg,*.svg,*.gif,*.pdf,*.mp4,*.bmp,*.webp
 [filter "lfs"]
 	clean = git-lfs clean -- %f
 	smudge = git-lfs smudge -- %f