fix: workspace/didChangeConfiguration error

[tMinamiii]

golangci-lint-langserver doesn't have workspace/didChangeConfiguration handler.
So the following error was outputted.

Sat 20 Aug 2022 05:31:18 PM JST:["<---(stderr)",1,"golangci-lint-langserver","golangci-lint-langserver: connections opened\n2022/08/20 17:31:18 jsonrpc2 handler: notification \"workspace/didChangeConfiguration\" handling error: jsonrpc2: code -32601 message: method not supported: workspace/didChangeConfiguration\n"]

golangci-lint-langserver worked fine, but I add workspace/didChangeConfiguration handler to avoid error log.

[nametake]

Thank you!

[tMinamiii]

thx!