Fixed the problem described in #16

[ebalaban]

No description provided.

[coveralls]

Coverage decreased (-0.1%) to 94.872% when pulling 6d006ed on tooltip-text-fix into bd77110 on master.

[codecov-io]

Codecov Report

Merging #17 into master will decrease coverage by 0.12%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #17      +/-   ##
==========================================
- Coverage      95%   94.87%   -0.13%     
==========================================
  Files           3        3              
  Lines          40       39       -1     
==========================================
- Hits           38       37       -1     
  Misses          2        2

Impacted Files	Coverage Δ
src/D3Trees.jl	95.45% <100%> (-0.2%)	⬇️

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[zsunberg]

Thanks!