add package-lock.json into the source zip

build-extension.sh

@@ -1,7 +1,8 @@
 #!/bin/sh
+
 npx rollup -c rollup.config.js
 
-zip -r singlefile-extension-source.zip manifest.json package.json _locales src rollup*.js .eslintrc.js build-extension.sh
+zip -r singlefile-extension-source.zip manifest.json package.json package-lock.json _locales src rollup*.js .eslintrc.js build-extension.sh
 
 rm singlefile-extension-firefox.zip singlefile-extension-chromium.zip singlefile-extension-edge.zip
 cp manifest.json manifest.copy.json