Added list of enhancement ideas

diff --git a/TODO b/TODO
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+1. Use json file instead of dbm to save state on disk. It is small
+   enough to overwrite it completely each time it changes and no
+   need to support cocurrent access
+2. Check mtime of configuration file and reread it if it changed.
+   Requires some refactoring
+   (log error and continue to use old loaded configuration if new file
+    contain errors. Store new timestamp to watch for further
+       modifications)
+