Update README to include supported Go Versions (#1470)

README.md

@@ -22,6 +22,7 @@
   - [Tests](#tests)
   - [Packages](#packages)
 - [Contribute](#contribute)
+- [Supported Go Versions](#supported-go-versions)
 
 ## Background
 
@@ -151,3 +152,8 @@ There's a few things you can do right now to help out:
  - Go through the modules below and **check out existing issues**. This would be especially useful for modules in active development. Some knowledge of IPFS/libp2p may be required, as well as the infrasture behind it - for instance, you may need to read up on p2p and more complex operations like muxing to be able to help technically.
  - **Perform code reviews**.
  - **Add tests**. There can never be enough tests.
+
+## Supported Go Versions
+
+We test against and support the two most recent major releases of Go. This is
+informed by Go's own [security policy](https://go.dev/security).