Added Missing set function

lib/t/set.rb

@@ -68,5 +68,12 @@ def website(uri)
       client.update_profile(url: uri)
       say "@#{@rcfile.active_profile[0]}'s website has been updated."
     end
+
+    desc 'profile link color', 'Sets a hex value that controls the color scheme of links used on the 
+    authenticating user’s profile page on twitter.com. '
+    def profile_link_color(color_code)
+      client.update_profile(profile_link_color: color_code)
+      say "@#{@rcfile.active_profile[0]}'s profile link color has been updated."
+    end
   end
 end

spec/set_spec.rb

@@ -149,4 +149,19 @@
       expect($stdout.string.chomp).to eq "@testcli's website has been updated."
     end
   end
+
+  describe 'profile_link_color' do
+    before do
+      @set.options = @set.options.merge('profile' => fixture_path + '/.trc')
+      stub_post('/1.1/account/update_profile.json').with(body: {profile_link_color: '0084B4'}).to_return(body: fixture('sferik.json'), headers: {content_type: 'application/json; charset=utf-8'})
+    end
+    it 'requests the correct resource' do
+      @set.profile_link_color('0084B4')
+      expect(a_post('/1.1/account/update_profile.json').with(body: {profile_link_color: '0084B4'})).to have_been_made
+    end
+    it 'has the correct output' do
+      @set.profile_link_color('0084B4')
+      expect($stdout.string.chomp).to eq "@testcli's profile link color has been updated."
+    end
+  end
 end