Make number of levels accurate

[ranjanan]

Fixes #18

[codecov-io]

Codecov Report

Merging #19 into master will increase coverage by 0.03%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master      #19      +/-   ##
==========================================
+ Coverage   54.28%   54.32%   +0.03%     
==========================================
  Files          10       10              
  Lines         490      486       -4     
==========================================
- Hits          266      264       -2     
+ Misses        224      222       -2

Impacted Files	Coverage Δ
src/aggregation.jl	0% <0%> (ø)	⬆️
src/classical.jl	100% <100%> (ø)	⬆️
src/multilevel.jl	73.91% <100%> (ø)	⬆️

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[coveralls]

Coverage increased (+0.04%) to 54.321% when pulling cb6d13f on levels into 5fa0e59 on master.