Also shallow-clone submodules

Author: physikerwelt

clone-extension.sh

@@ -6,5 +6,5 @@ BRANCH=$2
 #git clone https://gerrit.wikimedia.org/r/mediawiki/extensions/$EXTENSiON -b ${BRANCH} ${EXTENSION} \
 #|| git clone https://github.com/wikimedia/mediawiki-extensions-${EXTENSION}.git -b ${BRANCH} ${EXTENSION}
 
-git clone --recurse-submodules https://github.com/wikimedia/mediawiki-extensions-${EXTENSION}.git -b ${BRANCH} ${EXTENSION}
+git clone --depth=1 --recurse-submodules https://github.com/wikimedia/mediawiki-extensions-${EXTENSION}.git -b ${BRANCH} ${EXTENSION}
 rm -rf ${EXTENSION}/.git