Typo fixed

Author: os97673

ChangeLog.md

@@ -28,7 +28,7 @@
 
 ## [0.4.23.beta9](https://github.com/ruby-debug/ruby-debug-ide/compare/v0.4.23.beta8...v0.4.23.beta9)
 
-* problem with calculating local varibales for 1.8 fixed
+* problem with calculating local variables for 1.8 fixed
 
 ## "per-historical" changes 
 Dennis Ushakov <[email protected]>