Update changelog to include pr #90 (path references)

Author: JojOatXGME

CHANGELOG.md

@@ -7,6 +7,7 @@
 - Experimental support for resolving variables.
   The feature is disabled by default since the functionality is rather limited for now.
   Feel free to comment your feedback at [issue #87](https://github.com/NixOS/nix-idea/issues/87).
+- Support for resolving simple path references
 - Support for simple spell checking
 - Automatic insertion of closing quotes and braces
 - Support for *Code | Move Element Left/Right* (<kbd>Ctrl</kbd>+<kbd>Alt</kbd>+<kbd>Shift</kbd>+<kbd>←/→</kbd>)