fix links

Author: SethTisue

minutes/_posts/2018-06-19-june-19-2018.md

@@ -73,7 +73,7 @@ As Executive Director, Heather Miller summarized Scala Center
 activities since the last meeting.
 
 Heather's remarks were based on her
-[detailed report](../2018-06-19-june-19-2018.pdf)
+[detailed report](./2018-06-19-june-19-2018.pdf)
 on the Center's recent activities.
 
 The report includes links to a number of blog posts written

minutes/_posts/2019-03-06-march-6-2019.md

@@ -20,7 +20,7 @@ Coursier, Bloop, MOOCs, documentation, Metals, mdoc,
 Scala.js, SIP meetings for Scala 3, and Scala Days 2019.
 
 Full details on these activities are in
-[Sébastien's report](../2019-03-06-march-6-2019.pdf).
+[Sébastien's report](./2019-03-06-march-6-2019.pdf).
 
 The main additional topic discussed at the meeting was the question of
 allowing board members to contribute engineering effort directly
@@ -90,7 +90,7 @@ affiliations.
 As the Center's Executive Director, Sébastien Doeraene summarized
 Scala Center activities since the last meeting.
 
-Most of Seb's remarks were based on his [detailed report](../2019-03-06-march-6-2019.pdf)
+Most of Seb's remarks were based on his [detailed report](./2019-03-06-march-6-2019.pdf)
 on the Center's recent activities.  The following notes are a
 supplement to Sébastien's report.