Authored by Alexander Schuch

Update .gitmodules

1 [submodule "Vendors/libwebp"] 1 [submodule "Vendors/libwebp"]
2 path = Vendors/libwebp 2 path = Vendors/libwebp
3 - url = http://git.chromium.org/webm/libwebp.git 3 + url = https://chromium.googlesource.com/webm/libwebp