[DRE-maint] Bug#866198: this patch fixed dh-make-ruby

[Pirate Praveen]

After comparing citrus.gemspec, this patch made dh-make-ruby to work.
I'm not sure if original gemspec is valid ruby syntax.

diff -ru mustermann-1.0.0/mustermann.gemspec
mustermann-1.0.0+debian/mustermann.gemspec
--- mustermann-1.0.0/mustermann.gemspec	2017-06-28 12:54:46.000000000 +0530
+++ mustermann-1.0.0+debian/mustermann.gemspec	2017-06-28
13:10:06.138765241 +0530
@@ -1,4 +1,4 @@
-$:.unshift File.expand_path("../lib", __FILE__)
+$:.unshift(File.expand_path("../lib", __FILE__))
 require "mustermann/version"

 Gem::Specification.new do |s|

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