Update schedule.md

schedule.md

@@ -93,6 +93,15 @@ Presentations from [2017](schedule_2017.md).
 - December 10:
   - JOSS (Jeroen).
 
+- December 17:
+  - Slack alternatives (discussion).
+
+- January 7:
+  - ?
+
+- January 14:
+  - Education portfolio.
+ 
 - Upcoming.
   - Continuous integration (Ruben)
   - STR extraction (Jonathan)
@@ -113,6 +122,7 @@ Presentations from [2017](schedule_2017.md).
   - General purpose GPU computing.
   - Applied machine learning with SK-learn / scikit (Guy)
   - Complexity theory
+  - RISC-V and tiny FPGA
 
 - Notes.
   - Generic topics, but with a link to current activities.