Calendar: update version numbers

… to keep odd=bugfix / even=major.

wiki/src/contribute/calendar.mdwn

@@ -6,7 +6,7 @@
 
 * 2018-01-05, 14:00 (Berlin time): Additional Software team meeting
 
-* 2018-01-23: Release 3.4? (Firefox 52.6, bugfix release) — anonym is the RM
+* 2018-01-23: Release 3.5 (Firefox 52.6, bugfix release) — anonym is the RM
 
 * 2018-02-01, 16:00 (Berlin time): CI team meeting
 
@@ -14,22 +14,22 @@
 
 * 2018-03-05, 14:00 (Berlin time): Additional Software team meeting
 
-* 2018-03-13: Release 3.5? (Firefox 52.7, major release) — bertagaz is the RM
+* 2018-03-13: Release 3.6 (Firefox 52.7, major release) — bertagaz is the RM
 
 * 2018-04-05, 14:00 (Berlin time): Additional Software team meeting
 
 * 2018-05-04, 14:00 (Berlin time): Additional Software team meeting
 
-* 2018-05-08: Release 3.6? (Firefox 52.8, bugfix release) — bertagaz is the RM
+* 2018-05-08: Release 3.7 (Firefox 52.8, bugfix release) — bertagaz is the RM
 
 * 2018-06-05, 14:00 (Berlin time): Additional Software team meeting
 
-* 2018-07-03: Release 3.7? (Firefox 59.2, major release) — intrigeri is the RM
+* 2018-07-03: Release 3.8 (Firefox 59.2, major release) — intrigeri is the RM
 
 * 2018-07-05, 14:00 (Berlin time): Additional Software team meeting
 
-* 2018-08-28: Release 3.8? (Firefox 59.3, bugfix release) — anonym is the RM
+* 2018-08-28: Release 3.9 (Firefox 59.3, bugfix release) — anonym is the RM
 
-* 2018-10-23: Release 3.9? (Firefox 59.4, major release) — anonym is the RM
+* 2018-10-23: Release 3.10 (Firefox 59.4, major release) — anonym is the RM
 
-* 2018-11-27: Release 3.10? (Firefox 59.5, bugfix release) — anonym is the RM
+* 2018-11-27: Release 3.11 (Firefox 59.5, bugfix release) — anonym is the RM