Update python_requires to 3.5+

[TomAugspurger]

No description provided.

[codecov]

Codecov Report

Merging #26330 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #26330      +/-   ##
==========================================
- Coverage   92.04%   92.03%   -0.01%     
==========================================
  Files         175      175              
  Lines       52297    52297              
==========================================
- Hits        48137    48134       -3     
- Misses       4160     4163       +3

Flag	Coverage Δ
#multiple	90.59% <ø> (ø)	⬆️
#single	40.71% <ø> (-0.16%)	⬇️

Impacted Files	Coverage Δ
pandas/io/gbq.py	78.94% <0%> (-10.53%)	⬇️
pandas/core/frame.py	97.01% <0%> (-0.12%)	⬇️
pandas/util/testing.py	90.7% <0%> (+0.1%)	⬆️

---

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[codecov]

Codecov Report

Merging #26330 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #26330      +/-   ##
==========================================
- Coverage   92.04%   92.03%   -0.01%     
==========================================
  Files         175      175              
  Lines       52297    52297              
==========================================
- Hits        48137    48134       -3     
- Misses       4160     4163       +3

Flag	Coverage Δ
#multiple	90.59% <ø> (ø)	⬆️
#single	40.71% <ø> (-0.16%)	⬇️

Impacted Files	Coverage Δ
pandas/io/gbq.py	78.94% <0%> (-10.53%)	⬇️
pandas/core/frame.py	97.01% <0%> (-0.12%)	⬇️
pandas/util/testing.py	90.7% <0%> (+0.1%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update ee6b131...32bdd58. Read the comment docs.

[WillAyd]

Should we updated the classifiers in here as well?

[gfyoung]

Should we updated the classifiers in here as well?

Yes. Let's do in a follow-up.

[gfyoung]

Thanks @TomAugspurger !