jenkins slides & schedule update

README.md

@@ -14,8 +14,9 @@ Come to attend! Come to present!
 |3/10/2015|2020|Alex Masselot|Scala: 6 silver bullets|[slides](slides/20150309_dev_forum_scala)
 |3/24/2015|2019|Ivan Topolsky|Git at SIB|[slides](slides/20150324_git@vital-it.pdf)
 |4/7/2015|2020|Olivier Martin|What's new in Java 8?|
-|4/21/2015|2020|Roman Mylonas|Jenkins: continuous building and integration|
+|4/21/2015|2020|Roman Mylonas|Jenkins: continuous building and integration|[slides](slides/20150419_jenkins.pdf)
 |5/5/2015|2020|Fred Schutz|R & knitr|
 |5/19/2015|2019|Robin Liechti|Cytoscape.js|[slides](https://gitlab.isb-sib.ch/rliechti/cytoscape_js_pres)
 |6/2/2015|2019|Alex Masselot|MongoDB|[slides](https://gitlab.isb-sib.ch/amasselo/mongodb_devforum_20150601)
 |6/16/2015|2020|Thierry Schuepabch|Raspberry PI|
+|6/30/2015|2020|Dmitry Kuznetsov|An introduction RDF/SparQL|