added completion message to data download script

data/Makefile

@@ -1,10 +1,11 @@
 data:
-	for i in 1 2; do \
+	for i in 1 2 3 5 6; do \
 		for j in 1 2 3 4 5 6 7 8; do \
     		wget -O 'raw/sub'$$i'_run'$$j'_raw.nii.gz' https://nipy.bic.berkeley.edu/rcsds/ds113/sub00$$i/BOLD/task001_run00$$j/bold_dico_dico7Tad2grpbold7Tad_nl.nii.gz ;\
 		done \
 	done
 	gzip -d raw/*.gz
+	echo 'DATA DOWNLOAD COMPLETE: run "make validate" to verify data integrity'
 
 validate:
 	python data.py