fix typo

Thanks @distransient

Author: steveklabnik

text/0000-roadmap-2019.md

@@ -172,7 +172,7 @@ timezones and the community team wants to change that.
 
 The compiler team has five main themes of work for this year:
 
-- **Improving "core strength"** by lowering raw compilation times and also generating better code (which in turn can help with compilaton times)
+- **Improving "core strength"** by lowering raw compilation times and also generating better code (which in turn can help with compilation times)
 - **Improved IDE integration**, including support for typed completions
 - Extracting parts of rustc into **libraries**, which are easier to understand and maintain but also help in developing a Rust specification
 - Supporting lang team in **key feature development**, such as around `async fn` support, or improvements to the trait system