Mention updated Node version 12.x in README

Just passing by I noticed that it seems like it was overlooked to update the README in 89469e3
mozilla · May 15, 2020 · 5a02e32 · 5a02e32
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diff --git a/README.md b/README.md
@@ -30,7 +30,7 @@ A file sharing experiment which allows you to send encrypted files to other user
 
 ## Requirements
 
-- [Node.js 10.x](https://nodejs.org/)
+- [Node.js 12.x](https://nodejs.org/)
 - [Redis server](https://redis.io/) (optional for development)
 - [AWS S3](https://aws.amazon.com/s3/) or compatible service. (optional)