Update changelog.md

Ruben Schmidmeister · jeremystucki · web-flow · commit b431795db49c · 2019-03-04T13:50:11.000+01:00
Co-Authored-By: jeremystucki &lt;jeremy@myelin.ch&gt;
diff --git a/changelog.md b/changelog.md
@@ -15,4 +15,4 @@
     - Support calculating the `unit` vector
 
 ## 2.2
-- Add Vector::rotate
+- Add `Vector::rotate`
