Include link to Plan S on PlanSciPost page

scipost/templates/scipost/PlanSciPost.html

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     <h1 class="highlight">Plan Scipost</h1>
     <p class="ml-2 mr-2">At SciPost, we believe that cleaning up the business of scientific publishing requires building new infrastructure. We also believe that this business is most appropriately left in the hands of scientists themselves. Our achievements so far in the field of Physics have demonstrated the success and further potential of this approach.</p>
-    <p class="ml-2 mr-2">Increasing numbers of governments, funding agencies, universities and other academic instances have taken position in favour of a faster, larger-scale transition to Open Access. SciPost applauds these encouraging and empowering statements.</p>
+    <p class="ml-2 mr-2">Increasing numbers of governments, funding agencies, universities and other academic instances have taken position in favour of a faster, larger-scale transition to Open Access (see in particular the recently-announced <a href="https://www.scienceeurope.org/making-open-access-a-reality-by-2020/">Plan S</a>). SciPost applauds these encouraging and empowering statements.</p>
     <p class="ml-2 mr-2">Our initiative volunteers to provide the missing element in the proposed solutions: <strong>the infrastructure</strong>.</p>
 
     <h2 class="highlight">Our vision for the future</h2>