Don't pull in upstream DiffHighlight

We've diverged a little from upstream, so pulling it in directly
will break things

Author: scottchiefbaker

update-deps.sh

@@ -2,14 +2,3 @@
 
 # initalize the bats components
 git submodule sync && git submodule update --init
-
-
-DIFFHIGHLIGHT_RAW_URL_BASE="https://raw.githubusercontent.com/git/git/master/contrib/diff-highlight"
-DIFFHIGHLIGHT_FILES=( "DiffHighlight.pm" "README" )
-
-for file in "${DIFFHIGHLIGHT_FILES[@]}";
-do
-  url="$DIFFHIGHLIGHT_RAW_URL_BASE/$file"
-  echo "$url"
-  curl -#Lo "lib/$file" "$url"
-done