Make sprang@ owner in call

Video features may also need changed in call/. Therefore I suggest sprang becomes an owner.

Bug: none
Change-Id: I86badcf40034e588ebd041439443660f9bd8171e
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/189546
Reviewed-by: Erik Språng <sprang@webrtc.org>
Reviewed-by: Magnus Flodman <mflodman@webrtc.org>
Commit-Queue: Per Kjellander <perkj@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#32436}
diff --git a/call/OWNERS b/call/OWNERS
index 1be02c2..f863b93 100644
--- a/call/OWNERS
+++ b/call/OWNERS
@@ -2,3 +2,4 @@
 stefan@webrtc.org
 srte@webrtc.org
 terelius@webrtc.org
+sprang@webrtc.org