Small README revision

Author: JFrit

README.md

@@ -54,7 +54,7 @@ In the Hierarchy view, select the EyeTracker GameObject:
 
 Then, in the inspector, change the 'Selection' option in the EyeTracker to the desired
 EyeTracker implementation. Make sure that any required 3rd party software is already running (i.e.
-if using a PupilLabs eye tracker):
+Pupil Capture is required before using the PupilLabs eye tracker):
 
 ![eyetracker](docs/eyetracker.PNG)
 
@@ -145,4 +145,4 @@ Otherwise, a new Trial is created and then started.
 # Toggling Debug Visualizations
 
 To enable/disable debug visualizations such as a staircase counter, or gaze visualizer, simply activate or deactivate the "-----DEBUG SCRIPTS-----"
-GameObject in the hierarchy.
+GameObject in the hierarchy.