Added link to notifications proposal

en/logbook/_index.md

@@ -15,3 +15,4 @@ what travelers will write down in their log-entry at cccamp 2019 will be develop
 ## [personal time, wristband, individual design](/en/logbook/I-O-time-wristband-individual-design)
 ## [personale state LED](/en/logbook/personal-state-led)
 ## [topics near by](/en/logbook/topics-near-by)
+## [notifications](/en/logbook/notifications)
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