Add sponsorship info

Author: brianc

content/announcements.mdx

@@ -69,6 +69,8 @@ While not technically a breaking change for the module itself, I have begun the
 
 Thanks for reading that!  pg tries to be super pedantic about not breaking backwards-compatibility in non semver major releases....even for seemingly small things.  If you ever notice a breaking change on a semver minor/patch release please stop by the [repo](https://github.com/brianc/node-postgres) and open an issue!
 
+_If you find `pg` valuable to you or your business please consider [supporting](http://github.com/sponsors/brianc) it's continued development!  Big performance improvements, typescript, better docs, query pipelining and more are all in the works!_
+
 ## 2019-07-18
 
 ### New documentation