refactor: Move input to puzzles; update coverage script

Author: obalunenko

.gitignore

@@ -17,4 +17,5 @@
 bin/
 dist/
 release/
-.DS_Store
+.DS_Store
+coverage/

cmd/aoc-cli/main.go

@@ -11,8 +11,8 @@ import (
 	log "github.com/sirupsen/logrus"
 	"github.com/urfave/cli"
 
-	"github.com/obalunenko/advent-of-code/internal/input"
 	"github.com/obalunenko/advent-of-code/internal/puzzles"
+	"github.com/obalunenko/advent-of-code/internal/puzzles/input"
 	// register all solutions.
 	_ "github.com/obalunenko/advent-of-code/internal/puzzles/solutions"
 )