update changelog

CHANGELOG.md

@@ -4,13 +4,16 @@
 
 #### Features
 
+* Adds [graphql-upload](https://github.com/jaydenseric/graphql-upload) compatible scalar and link for proxying remote file uploads #671
+* Add ability to merge fields from types from different schemas
 * Adds transforms to wrap, extract, and rename fields #1183
 * Adds transform to filter object fields #819
 * Exports visitSchema, SchemaVisitor, healSchema, healTypes, cloneSchema, cloneType, cloneDirective to enable more custom transforms. #1070
 * Allows removing extra delegation layers by passing fetcher/link options directly to delegateToSchema, mergeSchemas, and transformSchema and by filtering directly with filterSchema without additional transformation round #1165
 
 #### Bug Fixes
 
+* Filter unused variables from map when proxying requests
 * Preserve subscription errors when using makeRemoteExecutableSchema
 * Preserve extensions when transforming schemas
 * Fix merging and transforming of custom scalars and enums #501, #1056, #1200