Remove deprecated AlphaVectorPolicy constructor

[zsunberg]

JuliaPOMDP/POMDPPolicies.jl#12

Just want to see if tests pass

[codecov]

Codecov Report

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@@            Coverage Diff            @@
##             master      #28   +/-   ##
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  Coverage          ?   51.95%           
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  Files             ?        9           
  Lines             ?      179           
  Branches          ?        0           
=========================================
  Hits              ?       93           
  Misses            ?       86           
  Partials          ?        0

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