Release api_core 1.8.2 (#7549)

* Release 1.8.2

Author: crwilcox

CHANGELOG.md

@@ -4,6 +4,17 @@
 
 [1]: https://pypi.org/project/google-api-core/#history
 
+## 1.8.2
+
+03-22-2019 16:27 PDT
+
+
+### Implementation Changes
+- Remove classifier for Python 3.4 for end-of-life. ([#7535](https://github.com/googleapis/google-cloud-python/pull/7535))
+
+### Internal / Testing Changes
+- When re-opening a `ResumableBidiRPC` set `_request_queue_generator` to `None`. ([#7548](https://github.com/googleapis/google-cloud-python/pull/7548))
+
 ## 1.8.1
 
 03-12-2019 12:45 PDT