Fix function path

Author: ehrenfeu

CHANGELOG.md

@@ -161,8 +161,8 @@ detailed information, please refer to the updated API documentation.
 
 ### Changed
 
-* `imcflibs.listdir_matching` changed to be able to use regex patterns for
-  matching. The regex pattern is passed as a string and the function will
+* `imcflibs.pathtools.listdir_matching` changed to be able to use regex patterns
+  for matching. The regex pattern is passed as a string and the function will
   return a list of all files matching the regex pattern.
 * `imcflibs.imagej.misc.calculate_mean_and_stdv` to allow for rounding the results.