Fix isort issues (#309)

ocelotl · c24t · commit 2bb6a177d90e · 2019-11-27T11:40:10.000-08:00
diff --git a/.isort.cfg b/.isort.cfg
@@ -14,3 +14,4 @@ line_length=79
 multi_line_output=3
 skip=target
 skip_glob=ext/opentelemetry-ext-jaeger/src/opentelemetry/ext/jaeger/gen/*
+known_first_party=opentelemetry
