Update CHANGES.txt for version 3.6.135

Updated CHANGES.txt to reflect changes in version 3.6.135, including fixes for smart quotes, command paths, and scheduled task detection.

CHANGES.txt

@@ -1,3 +1,8 @@
+v3.6.135
+- Changed to replace curly/smart quotes (from db files edited in Word or in iOS) before backing db files to prevent jq errors.
+- Added `/usr/syno/bin` or `/usr/syno/sbin` to the syno... commmands that were missing the full path (for people with a corrupt or edited PATH). Issue #601
+- Bug fix for not detecting script was running from triggered scheduled task.
+
 v3.6.134
 - Bug fix for trying to backup M.2 PCIe card's .db.new when it didn't exist which caused the following error. Issue #599
   - **cp: cannot stat '': No such file or directory