Dont send ids to server

[casperstr]

Hi! 👋

Firstly, thanks for your work on this project! 🙂

The graphql-over-http spec does not specify any id beeing sent over the wire.
Therefore this might fail on certain servers.

diff --git a/node_modules/react-relay-network-modern/lib/RelayRequest.js b/node_modules/react-relay-network-modern/lib/RelayRequest.js
index e36ec20..5a52da1 100644
--- a/node_modules/react-relay-network-modern/lib/RelayRequest.js
+++ b/node_modules/react-relay-network-modern/lib/RelayRequest.js
@@ -62,7 +62,7 @@ var RelayRequest = /*#__PURE__*/function () {
         }
 
         var formData = new _FormData_();
-        formData.append('id', this.getID());
+        formData.append('operationName', this.getID());
         formData.append('query', this.getQueryString());
         formData.append('variables', JSON.stringify(this.getVariables()));
         Object.keys(uploadables).forEach(function (key) {
@@ -74,7 +74,7 @@ var RelayRequest = /*#__PURE__*/function () {
       }
 
       return JSON.stringify({
-        id: this.getID(),
+        operationName: this.getID(),
         query: this.getQueryString(),
         variables: this.getVariables()
       });