Remove stable from help wording (There will be only one main branch for now)

diff --git a/youtube-dl b/youtube-dl
index ec9802b..c919c40 100755 (executable)
--- a/youtube-dl
+++ b/youtube-dl
@@ -3159,7 +3159,7 @@ def parseOpts():
        general.add_option('-v', '--version',
                        action='version', help='print program version and exit')
        general.add_option('-U', '--update',
-                       action='store_true', dest='update_self', help='update this program to latest stable version')
+                       action='store_true', dest='update_self', help='update this program to latest version')
        general.add_option('-i', '--ignore-errors',
                        action='store_true', dest='ignoreerrors', help='continue on download errors', default=False)
        general.add_option('-r', '--rate-limit',