Improve type annotations in spiderfoot/target.py

[codecov-commenter]

Codecov Report

Merging #1777 (3734bbf) into master (b0d2ccc) will increase coverage by 0.00%. The diff coverage is 100.00%.

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@@           Coverage Diff           @@
##           master    #1777   +/-   ##
=======================================
  Coverage   46.70%   46.71%           
=======================================
  Files         690      690           
  Lines       45665    45671    +6     
=======================================
+ Hits        21329    21334    +5     
- Misses      24336    24337    +1     

Impacted Files	Coverage Δ
spiderfoot/target.py	96.19% <100.00%> (+0.19%)	:arrow_up:

... and 1 file with indirect coverage changes

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[smicallef]

Thanks for the contribution!