`avg` "max" is incorrect

[johnsonjh]

avg "max" is incorrect. Example:

$ printf '%s\n' 9999 8888 77 6 5 4 3 2 1 | ./avg -v             
Arithmetic Mean:    2109.444444
Median:             5.000000
Mode:               (5, 6, 4, 2, 3, 8888, 1, 77, 9999)
Geometric Mean:     25.720955
Harmonic Mean:      3.653784
Standard Deviation: 3929.019700
Min:                1
Max:                8888
Sum:                18985

Fixed in PR #3.