Merge lp:~widelands-dev/widelands/changelog-networking into lp:widelands

[Notabilis]

Better explanations for networking changes in ChangeLog.

Assuming that the ChangeLog will be displayed to players/endusers, I added some better explanations regarding the changes of the networking code.

[kaputtnik (franku)]

Not a code relevant change.

@bunnybot merge

[bunnybot (widelandsofficial)]

Continuous integration builds have changed state:

Travis build 3607. State: passed. Details: https://travis-ci.org/widelands/widelands/builds/391403439.
Appveyor build 3409. State: success. Details: https://ci.appveyor.com/project/widelands-dev/widelands/build/_widelands_dev_widelands_changelog_networking-3409.

=== modified file 'ChangeLog'
--- ChangeLog	2018-03-27 20:00:21 +0000
+++ ChangeLog	2018-06-12 18:18:01 +0000
@@ -291,16 +291,14 @@
 
 ### Networking
 
-  - Implemented a relay server - opening a router port is no longer necessary
-    for the host
-  - Added IPv6 support for non-metaserver games
-  - Deliver received network packets even when the TCP connection is already
-    closed
-  - Improved the relogin code by adding semi-constant user ids that are valid
-    for 12 hours, and doubled logins with registered accounts
+  - Replaced SDL-Net with Boost.Asio
+  - Added IPv6 support
+  - Implemented a relay server. Opening a router port is no longer necessary
+    for the host of internet games
+  - Improved the online login code by adding semi-constant user ids that are
+    valid for 12 hours, allowing to reclaim a username after a disconnect
   - Increasing password security by no longer storing and transmitting it in
     plaintext
-  - Replaced SDL-Net with Boost.Asio
   - Fixed bug #1691335: Multiplayer client crashes when the host hasn't selected
                         a map yet