Fix GULResetLogger API breakage (#2552)

* Fix GULResetLogger API breakage

* podspec and CHANGELOG

* typo

Author: paulb777

GoogleUtilities.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name             = 'GoogleUtilities'
-  s.version          = '5.4.0'
+  s.version          = '5.4.1'
   s.summary          = 'Google Utilities for iOS (plus community support for macOS and tvOS)'
 
   s.description      = <<-DESC

GoogleUtilities/CHANGELOG.md

@@ -1,5 +1,8 @@
 # Unreleased
 
+# 5.4.1
+- Fix GULResetLogger API breakage. (#2551)
+
 # 5.4.0
 - Update GULLogger to use os_log instead of asl_log on iOS 9 and later. (#2374, #2504)
 

GoogleUtilities/Logger/GULLogger.m

@@ -36,6 +36,12 @@
   });
   return messageCodeRegex;
 }
+
+// GULResetLogger is unused but depended on by FirebaseCore versions 5.3.x and earlier.
+// It cannot be removed until GoogleUtilities does a breaking change release since FirebaseCore
+// allows GoogleUtilities to float up to the highest 5.x version.
+void GULResetLogger() {
+}
 #endif
 
 @implementation GULLogger (Internal)