message: doc(contributing): add missing donation link
diff: @@ -128,6 +128,7 @@ As a pure community-driven project without major corporate backing, we also welc
  - [Become a backer or sponsor on Patreon](https://www.patreon.com/evanyou)
  - [Become a backer or sponsor on OpenCollective](https://opencollective.com/vuejs)
  +- [One-time donation via PayPal or crypto-currencies](https://vuejs.org/support-vuejs/#One-time-Donations)
  ### What's the difference between Patreon and OpenCollective funding?
  