Fix pochhammer for a vector of n

[jishnub]

This fixes

julia> pochhammer(3,1:5)
5-element Vector{Int64}:
    3
   12
   60
  360
 2520

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.30%. Comparing base (b2cd0e8) to head (09b8a63).
Report is 12 commits behind head on master.

❗ Current head 09b8a63 differs from pull request most recent head 3b7996c

Please upload reports for the commit 3b7996c to get more accurate results.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #219      +/-   ##
==========================================
- Coverage   82.78%   82.30%   -0.48%     
==========================================
  Files          16       15       -1     
  Lines        2805     2537     -268     
==========================================
- Hits         2322     2088     -234     
+ Misses        483      449      -34     

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