revert change that stripped types imports from init.py

[crwilcox]

No description provided.

[codecov-io]

Codecov Report

Merging #78 into master will increase coverage by 3.17%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master     #78      +/-   ##
=========================================
+ Coverage   80.12%   83.3%   +3.17%     
=========================================
  Files          28      28              
  Lines        1107    1108       +1     
  Branches      112     112              
=========================================
+ Hits          887     923      +36     
+ Misses        128      93      -35     
  Partials       92      92

Impacted Files	Coverage Δ
dialogflow_v2beta1/__init__.py	100% <100%> (ø)	⬆️
dialogflow_v2beta1/types.py	100% <0%> (+100%)	⬆️

---

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 45aabf7...1bbe2da. Read the comment docs.