Update CHANGES.md (#39)

* Update CHANGES.md
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 # Changes
 
+## 0.2.0
+
+1. Adapt the new v3 protocol.
+2. Implement correlation protocol.
+3. Support batch segment report.
+4. Fix wrong context carrier endpoint data.
+5. Rocks: fixed wrong version of luarocks.
+6. Remove first ref variable.
+7. Uniform the SpanLayer type name.
+
 ## 0.1.0
 1. Establish the LUA tracing core.
 2. Add the tracer implementation based on Nginx OpenResty.
+