Specify required nodejs version

When running the echo.js demo I got the following exception

$ nodejs echo.js localhost 25565

.../node_modules/minecraft-protocol/dist/transforms/framing.js:112
          } else throw e;
                       ^
TypeError: Object REGISTER,UNREGISTER,MC|TrSel,MC|TrList has no method 'find'
    at Client.onCustomPayload (.../node_modules/minecraft-protocol/dist/client/pluginChannels.js:45:28)
    at Client.EventEmitter.emit (events.js:98:17)
    at Parser.<anonymous> (.../node_modules/minecraft-protocol/dist/client.js:101:16)
    at Parser.EventEmitter.emit (events.js:95:17)
    at readableAddChunk (.../node_modules/protodef/node_modules/readable-stream/lib/_stream_readable.js:217:18)
    at Parser.Readable.push (.../node_modules/protodef/node_modules/readable-stream/lib/_stream_readable.js:176:10)
    at Parser.Transform.push (.../node_modules/protodef/node_modules/readable-stream/lib/_stream_transform.js:123:32)
    at Parser._transform (.../node_modules/protodef/dist/serializer.js:88:14)
    at Parser.Transform._read (.../node_modules/protodef/node_modules/readable-stream/lib/_stream_transform.js:159:10)
    at Parser.Transform._write (.../node_modules/protodef/node_modules/readable-stream/lib/_stream_transform.js:147:83)

The code in question calls find on an channels which happens to be an array. Thus the desired function is Array.prototype.find, not available in my nodejs version.

Updating nodejs did solve the problem:

• Version not working: v0.10.25
• Version working: v4.2.6

Please specify the required nodejs version or use an ES6 shim in order to avoid such confusion 😃

[roblabla]

Currently, the tests are being run on nodejs 4 according to circle.yml.

I guess we could set engine-strict to whatever is the lowest we have in circle.yml.

[rom1504]

the way we specify it is the correct way (https://docs.npmjs.com/files/package.json#engines) engineStrict is depreciated since npm 3