complete() DoubleSum fix; fix tests SymbolicUtils v1.4.0 changed argument order

[codecov[bot]]

Codecov Report

Merging #179 (9be93b3) into master (e3dde34) will decrease coverage by 0.08%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #179      +/-   ##
==========================================
- Coverage   81.97%   81.89%   -0.08%     
==========================================
  Files          24       24              
  Lines        4637     4635       -2     
==========================================
- Hits         3801     3796       -5     
- Misses        836      839       +3     

Files	Coverage Δ
src/index_meanfield.jl	82.72% <100.00%> (+0.50%)	:arrow_up:
src/index_utils.jl	96.56% <100.00%> (+0.01%)	:arrow_up:

... and 2 files with indirect coverage changes

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