remove outdated status note

Packages in this repository are in research and development,
but it's neither active nor early by now. Instead of a fixed
note that may or may not be up-to-date, people can determine
the status more accurately by looking at the code frequency
graph, and API stability by looking at the semantic version.

README.md

@@ -7,8 +7,6 @@ Package `graphql` provides a GraphQL client implementation.
 
 For more information, see package [`github.com/shurcooL/githubv4`](https://github.com/shurcooL/githubv4), which is a specialized version targeting GitHub GraphQL API v4. That package is driving the feature development.
 
-**Status:** In active early research and development. The API will change when opportunities for improvement are discovered; it is not yet frozen.
-
 Installation
 ------------
 

doc.go

@@ -4,8 +4,5 @@
 // which is a specialized version targeting GitHub GraphQL API v4.
 // That package is driving the feature development.
 //
-// Status: In active early research and development. The API will change when
-// opportunities for improvement are discovered; it is not yet frozen.
-//
 // For now, see README for more details.
 package graphql // import "github.com/shurcooL/graphql"