Lecture 19 updated files

f22/meena_lec_notes/lec-19/cs220_survey_data.csv

f22/meena_lec_notes/lec-19/cs220_survey_data.json

f22/meena_lec_notes/lec-19/lec_19_json.ipynb

f22/meena_lec_notes/lec-19/lec_19_json_template.ipynb

f22/meena_lec_notes/lec-19/lecture_cs220_data.json

f22/meena_lec_notes/lec-19/major_cs220_data.json

f22/meena_lec_notes/lec-19/score_history.json

f22/meena_lec_notes/lec-19/section_cs220_data.json

f22/meena_lec_notes/lec-19/weather.json