Add drivetrain to y2017

Change-Id: I7494fd6c4b242ceb4aba26c9b5ddee064f29f382
diff --git a/y2017/constants.cc b/y2017/constants.cc
index 33deee3..36cf348 100644
--- a/y2017/constants.cc
+++ b/y2017/constants.cc
@@ -38,18 +38,21 @@
     case 1:  // for tests
       return new Values{
           5.0,  // drivetrain max speed
+          0.0,  // down error
       };
       break;
 
     case kCompTeamNumber:
       return new Values{
           5.0,  // drivetrain max speed
+          0.0,  // down error
       };
       break;
 
     case kPracticeTeamNumber:
       return new Values{
           5.0,  // drivetrain max speed
+          0.0,  // down error
       };
       break;