chore: release v0.2.0

- Handle non-monotonic clocks.
- Reduce the chances of fake bandwidth spikes (e.g., because a large
  message is reported all at once).
- Modernize some code (modern go atomics, etc.).

version.json

@@ -1,3 +1,3 @@
 {
-  "version": "v0.1.0"
+  "version": "v0.2.0"
 }