Merge pull request #91 from emiliom/ohw21

Added ohw10 ref and link in section-01

Author: emiliom

jekyll-spectral-theme/_includes/section-01.html

@@ -27,8 +27,10 @@ <h2>About OceanHackWeek</h2>
 			<p>
 				<a href="hackweek.html">What is a Hackweek?</a>
 				|
-				See the previously held <a href="https://oceanhackweek.github.io/ohw19/">OceanHackWeek 2019</a> and
-				<a href="https://oceanhackweek.github.io/ohw2018/">OceanHackWeek 2018</a>
+				See the previously held OceanHackWeek events from 
+				<a href="https://oceanhackweek.github.io/ohw20/">2020</a>, 
+				<a href="https://oceanhackweek.github.io/ohw19/">2019</a> and
+				<a href="https://oceanhackweek.github.io/ohw2018/">2018</a>.
 			</p>
 		</header>
 	</div>