add day 21 to readme

vaskoz · Sep 11, 2018 · 24f059a · 24f059a
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commit 24f059a
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diff --git a/README.md b/README.md
@@ -34,3 +34,4 @@ problems from
 * [Day 19 Flight Itinerary](https://github.com/vaskoz/dailycodingproblem-go/issues/45)
 * [Day 19 Sudoku Solver](https://github.com/vaskoz/dailycodingproblem-go/issues/47)
 * [Day 20](https://github.com/vaskoz/dailycodingproblem-go/issues/49)
+* [Day 21](https://github.com/vaskoz/dailycodingproblem-go/issues/51)