Computed buffer size for newick trees too small.

[jeromekelleher]

Closes #753

[codecov]

Codecov Report

Merging #754 into master will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #754   +/-   ##
=======================================
  Coverage   87.69%   87.69%           
=======================================
  Files          24       24           
  Lines       19387    19387           
  Branches     3640     3640           
=======================================
  Hits        17001    17001           
  Misses       1297     1297           
  Partials     1089     1089           

Flag	Coverage Δ
#c_tests	85.27% <ø> (ø)
#python_c_tests	90.16% <100.00%> (ø)
#python_tests	99.02% <100.00%> (ø)

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Impacted Files	Coverage Δ
python/tskit/trees.py	98.25% <100.00%> (ø)

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