Make input chomped array (#1)

With a lot of these problems the input typically needs to be parsed to its lines, and `File.readlines(path, chomp: true)` will also strip newlines making it relatively clean to work with inside the solutions.

lib/advent_of_code_cli/commands/solve.rb

@@ -10,7 +10,7 @@ def execute
         raise MissingSolutionError unless File.exist?(solution_file_name)
 
         say "Reading input..."
-        input = File.read(input_file_name).strip
+        input = File.readlines(input_file_name, chomp: true)
 
         say "Loading solution..."
         load(solution_file_name)