fix TypeError [ERR_UNKNOWN_ENCODING]: Unknown encoding: base64url

[Chelovek760]

Setup:

• docker
• Mac M1

Node 12 return

 } reason:
    TypeError [ERR_UNKNOWN_ENCODING]:
      Unknown encoding: base64url
     at Uint8Array.toString (buffer.js:800:11)
     at Object.generateVAPIDKeys (/usr/local/lib/node_modules/shadowsocks-manager/node_modules/web-push/src/vapid-helper.js:63:32)
     at Object.<anonymous> (/usr/local/lib/node_modules/shadowsocks-manager/plugins/webgui/server/push.js:2:27)
     at Module._compile (internal/modules/cjs/loader.js:999:30)
     at Object.Module._extensions..js (internal/modules/cjs/loader.js:1027:10)
     at Module.load (internal/modules/cjs/loader.js:863:32)
     at Function.Module._load (internal/modules/cjs/loader.js:708:14)
     at Module.require (internal/modules/cjs/loader.js:887:19)
     at require (internal/modules/cjs/helpers.js:74:18)
     at global.appRequire (/usr/local/lib/node_modules/shadowsocks-manager/init/utils.js:4:33)
     at Object.<anonymous> (/usr/local/lib/node_modules/shadowsocks-manager/plugins/webgui/server/home.js:12:14)
     at Module._compile (internal/modules/cjs/loader.js:999:30)
     at Object.Module._extensions..js (internal/modules/cjs/loader.js:1027:10)
     at Module.load (internal/modules/cjs/loader.js:863:32)
     at Function.Module._load (internal/modules/cjs/loader.js:708:14)
     at Module.require (internal/modules/cjs/loader.js:887:19) {
   code: 'ERR_UNKNOWN_ENCODING'
 }

Node 14 solve this error