Added "Sum" to the Table of Contents (#14)
Added "Sum" to the Table of Contents (#14)

A link to the "Sum" example was missing from the Table of Contents. I have added it in.
danrevah/ngx-pipes,danrevah/ng-pipes,danrevah/ng2-pipes,danrevah/ng2-pipes,danrevah/ngx-pipes,danrevah/ng-pipes