Ensure to re-use TCP connection

[nakabonne]

Fixes: #6

[codecov-io]

Codecov Report

Merging #14 (85d28fd) into main (c1b5a2f) will decrease coverage by 8.60%.
The diff coverage is 6.53%.

@@            Coverage Diff             @@
##             main      #14      +/-   ##
==========================================
- Coverage   43.72%   35.12%   -8.59%     
==========================================
  Files          10       10              
  Lines         501      504       +3     
==========================================
- Hits          219      177      -42     
- Misses        238      289      +51     
+ Partials       44       38       -6     

Impacted Files	Coverage Δ
agent/agent.go	42.50% <0.00%> (-18.25%)	⬇️
diagnoser/diagnoser.go	38.89% <17.65%> (-1.49%)	⬇️
stats/stats.go	0.00% <0.00%> (-88.23%)	⬇️
stats/meta.go	34.79% <0.00%> (-56.52%)	⬇️

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