Remove new line from nextstrain newick

[benjeffery]

Fixes #52

[codecov[bot]]

Codecov Report

Merging #53 (a872a5a) into main (a1fafb4) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #53   +/-   ##
=======================================
  Coverage   76.10%   76.10%           
=======================================
  Files           5        5           
  Lines         159      159           
  Branches       39       39           
=======================================
  Hits          121      121           
  Misses         37       37           
  Partials        1        1           

Impacted Files	Coverage Δ
tsconvert/newick.py	80.32% <100.00%> (ø)

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