Define appversion_nobuild in config.py for use elsewhere

Already need this in update.py, but will also adjust the 'Release Notes'
URL to use this, not full version.

config.py

@@ -11,7 +11,9 @@ appcmdname = 'EDMC'
 # appversion **MUST** follow Semantic Versioning rules:
 # <https://semver.org/#semantic-versioning-specification-semver>
 # Major.Minor.Patch(-prerelease)(+buildmetadata)
-appversion = '4.0.2'
+appversion = '4.0.2' #-rc1+a872b5f'
+# For some things we want appversion without (possible) +build metadata
+appversion_nobuild = appversion.split(sep='+')[0]
 copyright = u'© 2015-2019 Jonathan Harris, 2020 EDCD'
 
 update_feed = 'https://raw.githubusercontent.com/EDCD/EDMarketConnector/releases/edmarketconnector.xml'

update.py

@@ -6,7 +6,7 @@ import threading
 from traceback import print_exc
 
 # ensure registry is set up on Windows before we start
-from config import appname, appversion, update_feed, update_interval, config
+from config import appname, appversion, appversion_nobuild, update_feed, update_interval, config
 
 
 if not getattr(sys, 'frozen', False):
@@ -100,8 +100,7 @@ elif sys.platform=='win32':
                 # NB: It 'accidentally' supports pre-release due to how it
                 # splits and compares strings:
                 # <https://github.com/vslavik/winsparkle/issues/214>
-                appversion_nobuildmetadata = appversion.split(sep='+')[0]
-                self.updater.win_sparkle_set_app_build_version(appversion_nobuildmetadata)
+                self.updater.win_sparkle_set_app_build_version(appversion_nobuild)
 
                 # set up shutdown callback
                 global root