fix(logging): log incoming channel updates

Log incoming data via the channel graph subscription to make it easier
to see what data is being received from lnd behind the scenes.

app/lib/lnd/subscribe/channelgraph.js

@@ -5,6 +5,7 @@ export default function subscribeToChannelGraph() {
   const call = this.lnd.subscribeChannelGraph({})
 
   call.on('data', channelGraphData => {
+    mainLog.info('CHANNELGRAPH:', channelGraphData)
     if (this.mainWindow) {
       this.mainWindow.send('channelGraphData', { channelGraphData })
     }
@@ -12,6 +13,7 @@ export default function subscribeToChannelGraph() {
   call.on('end', () => mainLog.info('end'))
   call.on('error', error => error.code !== status.CANCELLED && mainLog.error(error))
   call.on('status', channelGraphStatus => {
+    mainLog.info('CHANNELGRAPHSTATUS:', channelGraphStatus)
     if (this.mainWindow) {
       this.mainWindow.send('channelGraphStatus', { channelGraphStatus })
     }