Fix Thanks, mention issue @japaric mentioned

Author: jamesmunns

newsletters/2018-03-29.md

@@ -67,8 +67,12 @@ This is a list of recently released drivers that are part of the [Weekly Driver
 
 ## Thanks
 
-> TODO: Thank some people from the other rust teams, like @nagisa,
-> @oli-obk, and ???
+* Thanks to all of the Rust Team and Working Group members who took time at the All Hands to tackle some important Embedded Issues
+* Thanks to [Alex Chrichton] who pushed a fix to a [linker issue] mentioned in our [last newsletter]
+
+[Alex Chrichton]: https://github.com/alexcrichton
+[linker issue]: https://github.com/rust-lang/rust/pull/49316
+[last newsletter]: https://github.com/rust-lang-nursery/embedded-wg/blob/master/newsletters/2018-03-15.md
 
 ## Help Wanted