CHANGELOG.md in debugger-1.2.0 vs CHANGELOG.md in debugger-1.2.1

@@ -1,4 +1,7 @@
+## 1.2.1
+* Bump ruby_core_source dependency
+
 ## 1.2.0
 * Add the ability to query the command and control port when starting remote debugging
 
 ## 1.1.4
 * Bump ruby_core_source dependency