Implicit subject should not use .new with modules

Fixes GitHub issue https://github.com/icy-arctic-fox/spectator/issues/6

spec/subject_spec.cr

@@ -2,6 +2,8 @@ require "./spec_helper"
 
 class Base; end
 
+module SomeModule; end
+
 Spectator.describe "Subject" do
   subject { Base.new }
 
@@ -10,4 +12,12 @@ Spectator.describe "Subject" do
       expect(subject).to be_a(Base)
     end
   end
+
+  context "module" do
+    describe SomeModule do
+      it "sets the implicit subject to the module" do
+        expect(subject).to be(SomeModule)
+      end
+    end
+  end
 end