[DRE-maint] Bug#816882: ruby-websocket-driver: must depend on ruby-websocket-extensions

[Hleb Valoshka]

Package: ruby-websocket-driver
Version: 0.6.3-1+b1
Severity: grave
Justification: renders package unusable

Dear Maintainer,

ruby-websocket-driver has missing dependency on ruby-websocket-extensions, so
it's impossible to use it.

-- System Information:
Debian Release: 8.3
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 3.16.0-4-amd64 (SMP w/4 CPU cores)
Locale: LANG=be_BY.utf8, LC_CTYPE=be_BY.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: sysvinit (via /sbin/init)