README: note new stability policy

Signed-off-by: Matt Layher <[email protected]>

Author: mdlayher

README.md

@@ -19,17 +19,14 @@ This package has a stable v1 API and any future breaking changes will prompt
 the release of a new major version. Features and bug fixes will continue to
 occur in the v1.x.x series.
 
-In order to reduce the maintenance burden, this package is only supported on
-Go 1.12+. Older versions of Go lack critical features and APIs which are
-necessary for this package to function correctly.
-
-**If you depend on this package in your applications, please use Go modules.**
+This package only supports the two most recent major versions of Go, mirroring
+Go's own release policy. Older versions of Go may lack critical features and bug
+fixes which are necessary for this package to function correctly.
 
 ## Design
 
-A [number of netlink packages](https://godoc.org/?q=netlink) are already
-available for Go, but I wasn't able to find one that aligned with what
-I wanted in a netlink package:
+A number of netlink packages are already available for Go, but I wasn't able to
+find one that aligned with what I wanted in a netlink package:
 
 - Straightforward, idiomatic API
 - Well tested
@@ -48,7 +45,7 @@ various netlink families, such as `NETLINK_GENERIC` or `NETLINK_ROUTE`.
 
 To have your package included in this diagram, please send a pull request!
 
-``` mermaid
+```mermaid
 flowchart LR
     netlink["github.com/mdlayher/netlink"]
     click netlink "https://github.com/mdlayher/netlink"