Fix spelling

Signed-off-by: Alexander Kurbatov <sir.alkurbatov@yandex.ru>

Author: alkurbatov

README.md

@@ -12,7 +12,7 @@
 <!-- markdown-toc end -->
 
 # adventofcode
-Solutions for [Advent of Code](https://adventofcode.com/) puzzles.
+Solutions to [Advent of Code](https://adventofcode.com/) puzzles.
 
 ## Development
 ### Setup dev environment