Correctly split version string

We changed the version format

gajim/common/optparser.py

@@ -57,7 +57,7 @@ class OptionsParser:
             return False
 
         new_version = app.config.get('version')
-        new_version = new_version.split('-', 1)[0]
+        new_version = new_version.split('+', 1)[0]
         seen = set()
         regex = re.compile(r"(?P<optname>[^.=]+)(?:(?:\.(?P<key>.+))?\.(?P<subname>[^.=]+))?\s=\s(?P<value>.*)")
 
@@ -82,7 +82,7 @@ class OptionsParser:
                 app.config.set_per(optname, key, subname, value)
 
         old_version = app.config.get('version')
-        old_version = old_version.split('-', 1)[0]
+        old_version = old_version.split('+', 1)[0]
 
         self.update_config(old_version, new_version)
         self.old_values = {} # clean mem

gajim/plugins/pluginmanager.py

@@ -509,7 +509,7 @@ class PluginManager(metaclass=Singleton):
             min_v = conf.get('info', 'min_gajim_version', fallback=None)
             max_v = conf.get('info', 'max_gajim_version', fallback=None)
 
-            gajim_v = app.config.get('version').split('-', 1)[0]
+            gajim_v = app.config.get('version').split('+', 1)[0]
             gajim_v_cmp = parse_version(gajim_v)
 
             if min_v and gajim_v_cmp < parse_version(min_v):