Changes in version 0.1.0.9000                      

  - Added a NEWS.md file to track changes to the package.
  - Use readr::read_table() instead of readr::read_delim() in
    aoc_input_data_frame()
  - Add user agent to aoc_get_input()
  - Add extract_numbers() to extract all numbers from a string
  - Add GCD() and LCM() for finding greatest common divisor and lowest
    common multiple
  - Add lines_to_matrix() to convert a vector of strings to a matrix
  - Add split_at_blanks() to create list from input, with one element
    per group originally separated by blank lines
  - Update aoc_input_vector() and aoc_input_matrix() to use readLines()
  - Add file argument to aoc_input_vector(), aoc_input_data_frame() and
    aoc_input_matrix() to read in any file in the directory for the
    given day and year.
  - Add aoc_new_conclusion() and aoc_delete_conclusion() functions to
    create and delete conclusion posts.