Adding link to training survey to config

bin/lesson_initialize.py

@@ -211,6 +211,7 @@ training_site: "https://swcarpentry.github.io/instructor-training"
 # Surveys.
 pre_survey: "https://www.surveymonkey.com/r/swc_pre_workshop_v1?workshop_id="
 post_survey: "https://www.surveymonkey.com/r/swc_post_workshop_v1?workshop_id="
+training_post_survey: "https://www.surveymonkey.com/r/post-instructor-training"
 
 # Start time in minutes (0 to be clock-independent, 540 to show a start at 09:00 am).
 start_time: 0