news_sources.md: Add programming.dev and lobste.rs sources

Author: jnareb

rev_news/news_sources.md

@@ -29,6 +29,8 @@ Some ideas on where we can go to gather Git Rev News material.
   [here](https://hn.algolia.com/?query=git&sort=byPopularity&prefix=false&page=0&dateRange=last24h&type=story) or
   [here](http://newscombinator.com/))
 * [Reddit/git](http://www.reddit.com/r/git) (offers RSS)
+* [Programming.dev/c/git](https://programming.dev/c/git) (a [Lemmy](https://join-lemmy.org/) server)
+* [Lobste.rs/t/vcs](https://lobste.rs/t/vcs)
 * [The Changelog/Git](https://changelog.com/topic/git/)
 * ...