Updated README

mi5ha · Oct 12, 2020 · f09df51 · f09df51
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@@ -50,6 +50,12 @@ composer create-project mi5ha/firebase-backend-api
 
 ## API
 
+With all requests send this header:
+
+```
+Content-Type: application/json
+```
+
 ### sendMulticastMessages
 
 Send notifications from one device to multiple other devices.