Use dot in expect with Kets

[david-pl]

No description provided.

[codecov]

Codecov Report

Merging #34 (6a8e1f5) into master (1a43219) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #34   +/-   ##
=======================================
  Coverage   92.52%   92.52%           
=======================================
  Files          24       24           
  Lines        2567     2567           
=======================================
  Hits         2375     2375           
  Misses        192      192           

Impacted Files	Coverage Δ
src/operators.jl	96.87% <100.00%> (ø)
src/operators_dense.jl	92.05% <100.00%> (ø)

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