update ping node readme

(how to run in snap)

io/ping/88-ping.html

@@ -18,7 +18,9 @@
     <p>Pings a machine and returns the trip time in mS as <code>msg.payload</code>.</p>
     <p>Returns <b>false</b> if no response received within 5 seconds, or if the host is unresolveable.</p>
     <p>Default ping is every 20 seconds but can be configured.</p>
-    <p><code>msg.topic</code> contains the target host ip.
+    <p><code>msg.topic</code> contains the target host ip.</p>
+    <p>Note: if running inside Ubuntu Snap you will need to manually start the network-observe interface.
+        `snap connect node-red:network-observe`</p>
 </script>
 
 <script type="text/javascript">

io/ping/README.md

@@ -11,9 +11,12 @@ Run the following command in your Node-RED user directory - typically `~/.node-r
 
     npm install node-red-node-ping
 
+
 **Gotchas**
 
- 1 This won't run on Ubunti Snap as the strict container does not allow spawning of external commands (like ping).
+ 1 Ubuntu Snap containers are strict and do not like giving external commands (like ping) external access. To allow ping to work you must manually add the network-observe interface
+
+     sudo snap connect node-red:network-observe
 
  2 On some versions on Raspbian (Raspberry Pi) `ping` seems to be a root only command.
 The fix is to allow it as follows

io/ping/package.json

@@ -1,6 +1,6 @@
 {
     "name"          : "node-red-node-ping",
-    "version"       : "0.0.16",
+    "version"       : "0.0.17",
     "description"   : "A Node-RED node to ping a remote server, for use as a keep-alive check.",
     "dependencies"  : {
     },