TST: add downstream deps in 3.6 build

[jreback]

No description provided.

[codecov]

Codecov Report

Merging #18333 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #18333      +/-   ##
==========================================
- Coverage   91.38%   91.36%   -0.02%     
==========================================
  Files         164      164              
  Lines       49782    49790       +8     
==========================================
- Hits        45493    45492       -1     
- Misses       4289     4298       +9

Flag	Coverage Δ
#multiple	89.17% <ø> (ø)	⬆️
#single	39.49% <ø> (-0.06%)	⬇️

Impacted Files	Coverage Δ
pandas/io/gbq.py	25% <0%> (-58.34%)	⬇️
pandas/core/frame.py	97.8% <0%> (-0.1%)	⬇️
pandas/core/series.py	95.02% <0%> (+0.01%)	⬆️
pandas/core/sparse/series.py	95.33% <0%> (+0.05%)	⬆️

---

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[codecov]

Codecov Report

Merging #18333 into master will decrease coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #18333      +/-   ##
==========================================
- Coverage   91.38%   91.34%   -0.05%     
==========================================
  Files         164      164              
  Lines       49790    49790              
==========================================
- Hits        45501    45480      -21     
- Misses       4289     4310      +21

Flag	Coverage Δ
#multiple	89.14% <ø> (-0.03%)	⬇️
#single	39.49% <ø> (-0.07%)	⬇️

Impacted Files	Coverage Δ
pandas/io/gbq.py	25% <0%> (-58.34%)	⬇️
pandas/plotting/_converter.py	63.44% <0%> (-1.82%)	⬇️
pandas/core/frame.py	97.8% <0%> (-0.1%)	⬇️

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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[jorisvandenbossche]

In which travis build are those tested?

[jreback]

these are now on the main 3.6 build via conda

they are also on the 3,6_BUILD_TEST via pip
but this was not failing when a test failed (need the -e on bash)