delete use of grep

auto-changelog.sh

@@ -4,7 +4,7 @@ URL="https://github.com/MetaMask/metamask-extension/pull/"
 LOG=$(git log $(git describe --tags $(git rev-list --tags --max-count=1))..HEAD --pretty="%s::%b"  --reverse --grep="Merge pull request #" --grep="(#");
 while read -r line; do
     SUBJECT="$(echo $line | sed -E  's/(.*):{2}(.*)/\1/')"
-    PR=$(echo $line | grep -Po '#\d+' | sed "s/#//") 
+    PR=$(echo $SUBJECT | sed 's/^.*(#\([^&]*\)).*/\1/' | sed 's/^.*#\([^&]*\) from.*/\1/')
     if [ -z "$(echo $line | sed -E  's/(.*):{2}(.*)/\2/')" ]; then
         MESSAGE=$(echo $SUBJECT | sed "s/(#$PR)//g"); else
         MESSAGE=$(echo $line | sed -E  's/(.*):{2}(.*)/\2/')