update shotcut to 2020.07.11

tested on a small video and a few effects, things work just fine.

Okay ?

Index: Makefile
===================================================================
RCS file: /cvs/ports/multimedia/shotcut/Makefile,v
retrieving revision 1.4
diff -u -p -r1.4 Makefile
--- Makefile 30 Jul 2020 14:40:07 -0000 1.4
+++ Makefile 8 Sep 2020 14:47:12 -0000
@@ -3,7 +3,7 @@
USE_WXNEEDED = Yes
COMMENT = video editor

-V = 20.06.28
+V = 20.07.11
DISTNAME = shotcut-$V

CATEGORIES = multimedia
Index: distinfo
===================================================================
RCS file: /cvs/ports/multimedia/shotcut/distinfo,v
retrieving revision 1.2
diff -u -p -r1.2 distinfo
--- distinfo 30 Jul 2020 14:40:07 -0000 1.2
+++ distinfo 8 Sep 2020 14:47:12 -0000
@@ -1,2 +1,2 @@
-SHA256 (shotcut-20.06.28.tar.gz) = 1Nn22cnrClSTthFF3aNfgV9knFmj13InK9hdazSCrZY=
-SIZE (shotcut-20.06.28.tar.gz) = 5797885
+SHA256 (shotcut-20.07.11.tar.gz) = d17p3PiHn65mhlljK4KCXtmhWL5qgijE0+9Ew1CZ/aU=
+SIZE (shotcut-20.07.11.tar.gz) = 5801379