Release api_core 1.8.1 (#7506)

* Release 1.8.1

Author: crwilcox

CHANGELOG.md

@@ -4,6 +4,13 @@
 
 [1]: https://pypi.org/project/google-api-core/#history
 
+## 1.8.1
+
+03-12-2019 12:45 PDT
+
+### Implementation Changes
+- Protect the creation of a background thread in BackgroundConsumer and wait on it starting. ([#7499](https://github.com/googleapis/google-cloud-python/pull/7499))
+
 ## 1.8.0
 
 02-23-2019 15:46 PST

setup.py

@@ -22,7 +22,7 @@
 
 name = "google-api-core"
 description = "Google API client core library"
-version = "1.8.0"
+version = "1.8.1"
 # Should be one of:
 # 'Development Status :: 3 - Alpha'
 # 'Development Status :: 4 - Beta'