Update changelog

Author: tomhoule

CHANGELOG.md

@@ -12,6 +12,11 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
   `rustls` rather than `native-tls`.
 - Code generated by the `graphql-client` CLI program now suppresses all
   warnings from rustc and clippy.
+- Derive from both variables and response for enum
+- Camel case input variables in .graphql files now generate snake_case variable names in Rust
+- Support Paths in response derives
+- cli: Display server responses when introspection failed
+- upgrade to graphql_parser 0.4
 
 ## 0.10.0 - 2021-07-04