Fix bad copy-paste mistake (#86)

* Fix bad copy-paste mistake

Fix #85

Author: gagbo

Diff for: CHANGELOG.md

@@ -18,6 +18,9 @@ versioning](https://go.dev/doc/modules/version-numbers).
 
 ### Fixed
 
+- [All] Fixes an issue where the caller function name is badly reported as a random slice of the
+  current function name (#85)
+
 ### Security
 
 ## [1.0.0](https://github.com/autometrics-dev/autometrics-go/releases/tag/v1.0.0) 2023-12-01

Diff for: pkg/autometrics/instrument.go

@@ -66,7 +66,7 @@ func callerInfo(ctx context.Context) (callInfo CallInfo) {
 				")", ""),
 				"*", "")
 
-			callInfo.Parent.Function = functionName[index+1:]
+			callInfo.Parent.Function = parentFrameFunctionName[index+1:]
 		}
 
 		return