update CHANGELOG.md notes
--
+# 3.8.19
+
+## Added
+- Added `JAEGER_AGENT_HOST` and `JAEGER_AGENT_PORT` environment variable to allow specifying host and port separately instead of as the full URL.
+ -- Note: you are still able to specify `TRACING_JAEGER_SAMPLING_SERVER_URL`
+
+# 3.8.13, 3.8.14, 3.8.15, 3.8.16, 3.8.17, 3.8.18
+
+## Added
+- experimental helm charts
+
# 3.8.12
## Changed
