Update README.md

Author: tjanson

README.md

@@ -13,6 +13,9 @@ The output format is bound to change often, so please look at [the relevant sect
 
 ## To-Do
 
-- [ ] collect real-world data on a variety of devices and see whether it's usable at all
-- [ ] make the app work while in the background (current behavior unknown)
-- [ ] visualize data points on map [wishlist]
+- [x] collect real-world data on a variety of devices and see whether it's usable at all
+- [x] make the app work while in the background [[possible improvements](https://github.com/tjanson/WifiLocationLogger/issues/1)]
+- [x] visualize data points on map
+- [ ] explore alternative visualizations, improve Hexbin visualization [to be published]
+- [ ] [lots of stuff regarding remote logging](https://github.com/tjanson/WifiLocationLogger/issues/5) plus DB backend
+- [ ] document tools for CSV handling and conversion

app/src/main/assets/logback.xml

@@ -49,7 +49,7 @@
     </appender>
 
     <appender name="SOCKET" class="ch.qos.logback.classic.net.SocketAppender">
-        <!-- Async + lazy + see
+        <!-- Async + lazy + IP instead of FQDN to avoid NetworkOnMainThreadExc., see
              https://github.com/tony19/logback-android/wiki/Appender-Notes#socketappender-syslogappender
         -->