docs: Update Readme

Author: obalunenko

README.md

@@ -121,7 +121,7 @@ This repository contains solutions for puzzles and cli tool to run solutions to
 <details>
   <summary>2018</summary>  
 
-  - [ ] [Day 1: Chronal Calibration](https://adventofcode.com/2018/day/1)
+  - [x] [Day 1: Chronal Calibration](https://adventofcode.com/2018/day/1)
   - [ ] [Day 2: Inventory Management System](https://adventofcode.com/2018/day/2)
   - [ ] [Day 3: No Matter How You Slice It](https://adventofcode.com/2018/day/3)
   - [ ] [Day 4: Repose Record](https://adventofcode.com/2018/day/4)