chore: release 1.26.1 (#693)

:robot: I have created a release \*beep\* \*boop\* 
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### [1.26.1](https://www.github.com/googleapis/google-auth-library-python/compare/v1.26.0...v1.26.1) (2021-02-11)


### Documentation

* fix a typo in the user guide (avaiable -> available) ([#680](https://www.github.com/googleapis/google-auth-library-python/issues/680)) ([684457a](https://www.github.com/googleapis/google-auth-library-python/commit/684457afd3f81892e12d983a61672d7ea9bbe296))
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This PR was generated with [Release Please](https://github.com/googleapis/release-please). See [documentation](https://github.com/googleapis/release-please#release-please).
diff --git a/setup.py b/setup.py
index 2f16e44..0df0a81 100644
--- a/setup.py
+++ b/setup.py
@@ -34,7 +34,7 @@
 with io.open("README.rst", "r") as fh:
     long_description = fh.read()
 
-version = "1.26.0"
+version = "1.26.1"
 
 setup(
     name="google-auth",