Move 2696 to final. (ethereum#2778)

* Moves 2696 to final.

* Removes review end date from 2696.

* Markes RequestArguments as readonly.

This came up in the discussion at ethereum#2319 (comment) (which this is just a break-out of).

EIPS/eip-2696.md

@@ -3,8 +3,7 @@ eip: 2696
 title: JavaScript `request` method RPC transport
 author: Micah Zoltu (@MicahZoltu)
 discussions-to: https://github.com/ethereum/EIPs/issues/2697
-status: Last Call
-review-period-end: 2020-07-09
+status: Final
 type: Standards Track
 category: Interface
 created: 2020-06-04
@@ -32,8 +31,8 @@ The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "S
 TypeScript interface definition:
 ```ts
 interface RequestArguments {
-	method: string;
-	params?: unknown[] | object;
+	readonly method: string;
+	readonly params?: readonly unknown[] | object;
 }
 
 interface EthereumProvider {