0.7.2 release (#763)

Author: c24t

CHANGELOG.md

@@ -4,6 +4,12 @@
 - Added `http code` to `grpc code` status code mapping on `utils`
   ([#746](https://github.com/census-instrumentation/opencensus-python/pull/746))
 
+## 0.7.2
+Released 2019-08-16
+
+- Fix GCP resource loading for certain environments
+  ([#761](https://github.com/census-instrumentation/opencensus-python/pull/761))
+
 ## 0.7.1
 Released 2019-08-05