Fix hamann

[koheiw]

Removed weight and corrected spelling to address #26. Fortunately, computation was correct as weight has always been 1.

[codecov]

Codecov Report

Merging #27 (73c3307) into master (bf4603e) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #27   +/-   ##
=======================================
  Coverage   99.45%   99.46%           
=======================================
  Files           4        4           
  Lines         369      371    +2     
=======================================
+ Hits          367      369    +2     
  Misses          2        2           

Impacted Files	Coverage Δ
R/proxy.R	99.06% <100.00%> (+0.01%)	⬆️
src/pair.cpp	100.00% <100.00%> (ø)

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