Bug#839807: unicorn: Missing depends on lsb-base

[Santiago Vila]

Forgot the (trivial) patch. Here it is.
--- a/debian/control
+++ b/debian/control
@@ -19,7 +19,8 @@ XS-Ruby-Versions: all
 Package: unicorn
 Architecture: kfreebsd-any linux-any
 XB-Ruby-Versions: ${ruby:Versions}
-Depends: ruby | ruby-interpreter,
+Depends: lsb-base,
+         ruby | ruby-interpreter,
          ruby-kgio (>= 2.10.0~),
          ruby-rack,
          ruby-raindrops (>= 0.16.0~),