Calendar: 3.11 will be a bugfix release and 3.11 a major one.

That's needed for our USB image project.

wiki/src/contribute/calendar.mdwn

@@ -25,11 +25,11 @@ All times are referenced to Berlin and Paris time.
 
 * 2018-12-03, 19:00: [[Contributors meeting|contribute/meetings]]
 
-* 2018-12-11: **Release 3.11** (Firefox 60.4, major release) — anonym is the RM
+* 2018-12-11: **Release 3.11** (Firefox 60.4, bugfix release) — anonym is the RM
 
 ## 2019Q1
 
-* 2019-01-29: **Release 3.12** (Firefox 60.5)
+* 2019-01-29: **Release 3.12** (Firefox 60.5, major release)
 
 * 2019-03-19: **Release 3.13** (Firefox 60.6)