chore: perf diff against latest release

bin/perf-diff.sh

@@ -0,0 +1,16 @@
+#!/usr/bin/bash
+
+VERSION_LATEST=$(cat package.json | grep '"version":' | awk -F'"' '{print $4}')
+FILE_LOCAL=dist/liquid.node.cjs.js
+FILE_LATEST=dist/liquid.node.cjs.$VERSION_LATEST.js
+URL_LATEST=https://unpkg.com/liquidjs@$VERSION_LATEST/dist/liquid.node.cjs.js
+
+if [ ! -f $FILE_LATEST ]; then
+    curl $URL_LATEST > $FILE_LATEST
+fi
+
+if [ ! -f $FILE_LOCAL ]; then
+    BUNDLES=cjs npm run build:dist
+fi
+
+node benchmark/diff.js $FILE_LOCAL $FILE_LATEST