Merge pull request #196 from graphql-rust/changelog-update-cli

Update CHANGELOG.md

Author: tomhoule

CHANGELOG.md

@@ -49,6 +49,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 - (BREAKING) GraphQLQuery does not take a lifetime parameter anymore. This makes it easier to work with futures in async client, since futures expect everything they capture to have the 'static lifetime.
 - (BREAKING) Removed the `Rust` prefix on the name of generated items.
+- (BREAKING) If you don't set `--selected-operation` options with `graphql-client generate`, the cli generate all queries in query file.
 
 ### Fixed