docs: update README

Author: marcelblijleven

README.md

@@ -18,24 +18,24 @@ Collection of my Advent of Code solutions in a slightly overkill project setup 
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 ## Completed ⭐️
 ### 2015
-- day 12015: part one ⭐️, part two ⭐️
-- day 22015: part one ⭐️, part two ⭐️
-- day 32015: part one ⭐️, part two ⭐️
-- day 42015: part one ⭐️, part two ⭐️
-- day 52015: part one ⭐️, part two ⭐️
-- day 62015: part one ⭐️, part two ⭐️
+- day 01: part one ⭐️, part two ⭐️
+- day 02: part one ⭐️, part two ⭐️
+- day 03: part one ⭐️, part two ⭐️
+- day 04: part one ⭐️, part two ⭐️
+- day 05: part one ⭐️, part two ⭐️
+- day 06: part one ⭐️, part two ⭐️
 ### 2020
-- day 12020: part one ⭐️, part two ⭐️
-- day 22020: part one ⭐️, part two ⭐️
-- day 32020: part one ⭐️, part two ⭐️
-- day 42020: part one ⭐️, part two ⭐️
-- day 52020: part one ⭐️, part two ⭐️
-- day 62020: part one ⭐️, part two ⭐️
-- day 72020: part one ⭐️, part two ⭐️
-- day 82020: part one ⭐️, part two ⭐️
-- day 92020: part one ⭐️, part two ⭐️
-- day 102020: part one ⭐️, part two ⭐️
-- day 112020: part one ⭐️, part two ⭐️
+- day 01: part one ⭐️, part two ⭐️
+- day 02: part one ⭐️, part two ⭐️
+- day 03: part one ⭐️, part two ⭐️
+- day 04: part one ⭐️, part two ⭐️
+- day 05: part one ⭐️, part two ⭐️
+- day 06: part one ⭐️, part two ⭐️
+- day 07: part one ⭐️, part two ⭐️
+- day 08: part one ⭐️, part two ⭐️
+- day 09: part one ⭐️, part two ⭐️
+- day 10: part one ⭐️, part two ⭐️
+- day 11: part one ⭐️, part two ⭐️
 
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