Change should to must for consistency

MeetingNotes/solutions-committee-2015-12-07.md

@@ -31,7 +31,7 @@ After infrastructure and advance trials, the 45-day trial window will be too sho
 
 Before beginning advance trials, we should identify the basic service components. Focus on the web interface, since that will be the initial interaction for most users.
 
-(Proposed) The web interface should support:
+(Proposed) The web interface must support:
 
 * Git
     * Basic functions (init, branch, commit, log, merge, fork)