add support for epm play yandex-browser beta

play.d/yandex-browser.sh

 #!/bin/sh
 
 BRANCH=stable
-PKGNAME=yandex-browser-stable
 PRODUCTDIR=/opt/yandex/browser
 DESCRIPTION="Yandex browser from the official site"
 
-if [ "$1" = "--remove" ] ; then
-    epm remove $PKGNAME
-    epm remove $PKGNAME-codecs-ffmpeg-extra
-    exit
+if [ "$2" = "beta" ] ; then
+    BRANCH=beta
+    PRODUCTDIR=/opt/yandex/browser-$BRANCH
 fi
 
+PKGNAME=yandex-browser-$BRANCH
+
 . $(dirname $0)/common.sh
 
 [ "$($DISTRVENDOR -a)" != "x86_64" ] && echo "Only x86_64 is supported" && exit 1