Update computer-controlled_cutting.yaml

src/computer-controlled_cutting.yaml

 unit: Computer-Controlled Cutting
 unit_id: computer_controlled_cutting
-version: 2018
+version: 2019
 tasks:
 - name: Laser Cutting
   description: |
+      Group assignment
       * characterise you lasercutter, making lasercutter test part(s) that vary cutting settings and dimensions. (group project)
-      * cut something on the vinylcutter (individual)
+      Individual assignment
       * design, make, and document a parametric press-fit construction kit, accounting for the lasercutter kerf, which can be assembled in multiple ways (individual)
+      * For extra credit include elements that aren't flat.
   outcomes:
   - Demonstrate and describe parametric 2D modelling processes
   - Identify and explain processes involved in using the laser cutter.