update contributing docs (#219)

Author: Irev-Dev

contributing.md

@@ -2,7 +2,7 @@
 
 We really should automate publishing, but to document how it's done manually:
 
-1. Update the version in `package.json` and `package-lock.json` to the new version and merge that to main.
+1. Update the version in `package.json` to the new version and merge that to main.
 2. run `yarn install && yarn build && npm publish`
 3. run `git tag v<version> && git push --tags`
 4. create a release on github with the same tag.