chore: release 1.12.5 (#1075)

:robot: I have created a release \*beep\* \*boop\* 
---
### [1.12.5](https://www.github.com/googleapis/google-api-python-client/compare/v1.12.4...v1.12.5) (2020-10-22)


### Bug Fixes

* don't raise when downloading zero byte files ([#1074](https://www.github.com/googleapis/google-api-python-client/issues/1074)) ([86d8788](https://www.github.com/googleapis/google-api-python-client/commit/86d8788ee8a766ca6818620f3fd2899be0e44190))
---


This PR was generated with [Release Please](https://github.com/googleapis/release-please).
diff --git a/setup.py b/setup.py
index 33f7e5a..d4428d4 100644
--- a/setup.py
+++ b/setup.py
@@ -49,7 +49,7 @@
 with io.open(readme_filename, encoding="utf-8") as readme_file:
     readme = readme_file.read()
 
-version = "1.12.4"
+version = "1.12.5"
 
 setup(
     name="google-api-python-client",