fix: add mailto and hashtag links

Author: ashleygwilliams

_posts/2018-01-03-new-years-rust-a-call-for-community-blogposts.md

@@ -47,10 +47,12 @@ A great example of what we're looking for is this post,
 ["Rust in 2017"](https://medium.com/@Hisako1337/rust-in-2017-8f2b57a67d9b)
 by [Anonyfox](https://github.com/Anonyfox).
 
-You can write up these posts and email them to [email protected] or tweet them with the
-hashtag `#Rust2018`. We'll aggregate any blog posts sent via email or with the hashtag in one
+You can write up these posts and email them to <a href="mailto:[email protected]">[email protected]</a>
+or tweet them with the hashtag [`#Rust2018`]. We'll aggregate any blog posts sent via email or with the hashtag in one
 big blog post here. 
 
+[`#Rust2018`]: https://twitter.com/search?q=%23Rust2018
+
 The Core team will be reading all of the submitted posts and using them to inform the initial
 roadmap RFC for 2018. Once the RFC is submitted, we'll open up the normal RFC process, though
 if you want, you are welcome to write a post and link to it on the GitHub discussion.