0.13 - 2019/01/09
    - Allow a negative result in average method
      thanks to schwinn <schwinni@espionage.de>

0.12 - 2018/12/26
    - Added minimum perl version as suggested by CPANTS.
      thanks to Mohammad S Anwar <mohammad.anwar@yahoo.com>

0.11 - 2018/12/25
    - Make sum work with numeric values insted of integer.
      thanks to schwinn <schwinni@espionage.de>

0.10 - 2015/11/13
    - removed unused call to 'size'
    - update description for clarity

0.09 - 2015/10/31
    - updating pod for clarity

0.08 - 2015/10/30
    - defer average and sum calculations until needed
    - tweak pod

0.06 - 2015/10/22
    - clarify wording in pod

0.05 - 2015/10/22
    - use List::Util sum0 to add up values
    - fix typos and bad DESCRIPTION

0.04 - 2015/10/22
    - renamed max_size to limit

0.03 - 2015/10/21
    - get 'size' from Array delegation
    - return oldest element in array, useful if you need to know what 
      gets deleted if the array is maxed 

0.01 - 2015/10/21
    - Initial release