Added SYS_NICE to README since switching to Debian

README.md

@@ -13,15 +13,15 @@ equally well wherever you live in Sweden.
 
 ### As a client
 To simply use it as a client to synchronize your local computer clock, just
-run it and add the capability to change the clock. For example:
+run it and add the capability to change the clock and set the nice level. For example:
 
-    docker run -d --name ntp --cap-add SYS_TIME --restart=always jackbenny/swedish-ntp
+    docker run -d --name ntp --cap-add SYS_TIME --cap-add SYS_NICE --restart=always jackbenny/swedish-ntp
 
 ### As a server
 You need to publish UDP port 123 to be able to connect to the OpenNTPD daemon. 
 For example:
 
-    docker run -d --name ntp --cap-add SYS_TIME --publish 123:123/udp --restart=always jackbenny/swedish-ntp
+    docker run -d --name ntp --cap-add SYS_TIME --cap-add SYS_NICE --publish 123:123/udp --restart=always jackbenny/swedish-ntp
 
 # Additional information
 For more information about Netnod NTP servers, see [Netnod's NTP