fix: only send one newline after each record

[hacdias]

Each Line is a Valid JSON Value - (http://ndjson.org/)

Right now there's empty lines.

json.Encoder.Encode already adds a newline after each record: https://pkg.go.dev/encoding/json#Encoder.Encode

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (a011dbc) 0.92% compared to head (09500e7) 0.93%.

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Additional details and impacted files

@@          Coverage Diff          @@
##            main     #32   +/-   ##
=====================================
  Coverage   0.92%   0.93%           
=====================================
  Files         10      10           
  Lines        757     749    -8     
=====================================
  Hits           7       7           
+ Misses       749     741    -8     
  Partials       1       1           

Impacted Files	Coverage Δ
caskadht.go	0.00% <ø> (ø)
response_writer_dr.go	0.00% <ø> (ø)
response_writer_ipni.go	0.00% <ø> (ø)

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[masih]

Thanks @hacdias 👍