use constant from json_rpc_handler

Author: jcat4

lib/mcp/client.rb

@@ -2,8 +2,6 @@
 
 module MCP
   class Client
-    JSON_RPC_VERSION = "2.0"
-
     # Initializes a new MCP::Client instance.
     #
     # @param transport [Object] The transport object to use for communication with the server.
@@ -38,7 +36,7 @@ def initialize(transport:)
     #   end
     def tools
       response = transport.send_request(request: {
-        jsonrpc: JSON_RPC_VERSION,
+        jsonrpc: JsonRpcHandler::Version::V2_0,
         id: request_id,
         method: "tools/list",
       })
@@ -67,7 +65,7 @@ def tools
     #   Consult the documentation for your transport (e.g., MCP::Client::HTTP) for details.
     def call_tool(tool:, arguments: nil)
       response = transport.send_request(request: {
-        jsonrpc: JSON_RPC_VERSION,
+        jsonrpc: JsonRpcHandler::Version::V2_0,
         id: request_id,
         method: "tools/call",
         params: { name: tool.name, arguments: arguments },