Drug lookup added to listdose

listdose now supports filtering with drug

Signed-off-by: Pratyush Desai <pratyush.desai@liberta.casa>

plugin.py

@@ -284,9 +284,10 @@ class Tripsit(callbacks.Plugin):
                 return
 
             try:
+                rangecheck = doses[-int(history)]
                 irc.reply(f"Your last {history} dose(s) are:", private=True)
                 for number in range(history, 0, -1):
-                    lastdose = doses[-number]
+                    lastdose = doses[-int(number)]
                     dose = lastdose['dose']
                     drug = lastdose['drug']
                     method = lastdose['method']