add the mount-observe plug to the snap (#4853)

README.md

@@ -62,6 +62,12 @@ sudo snap install minio --edge
 
 Every time a new version of `minio` is pushed to the store, you will get it updated automatically.
 
+You will need to allow the minio snap to observe mounts in the system:
+
+```sh
+sudo snap connect minio:mount-observe
+```
+
 ## Microsoft Windows
 ### Binary Download
 | Platform| Architecture | URL|

snap/snapcraft.yaml

@@ -14,7 +14,12 @@ confinement: strict
 apps:
   minio:
     command: minio
-    plugs: [home, removable-media, network, network-bind]
+    plugs:
+      - home
+      - mount-observe
+      - network
+      - network-bind
+      - removable-media
 
 parts:
   minio: