Documentation and dependencies for v42r7 release.

ReleaseNotes/v42r7.md

-2017-12-12 DaVinci v42r7
+2017-12-18 DaVinci v42r7
 ========================
 
 Release for 2017 re-stripping campaign S29r2
@@ -8,6 +8,8 @@ This version is released on the 2017-patches branch.
 It is based on Gaudi v28r2, LHCb v42r6p1, Rec v21r6p1, Phys v23r7, Analysis v18r6 and Stripping v11r5.
 Uses LCG_88 with ROOT 6.08.06.
 
+- Updated ref for S29r2.
+  - See merge request lhcb/DaVinci!132
 - Added StrippingCache and DaVinciTests for S29r2.
   - See merge request lhcb/DaVinci!128
 - Validate DaVinci configuration for Turbo data.