unboxing seems to fail (with stacktrace)

[chetmurthy]

$ truffle version
Truffle v4.0.4 (core: 4.0.4)
Solidity v0.4.18 (solc-js)

$ truffle unbox tutorialtoken
Downloading...
Error: Error making request. Please check the format of the requested resource: https://raw.githubusercontent.com/truffle-box/tutorialtoken-box/master/truffle.js
at Request._callback (/home/chet/Hack/nodejs-8.9.4/lib/node_modules/truffle/build/cli.bundled.js:313430:23)
at self.callback (/home/chet/Hack/nodejs-8.9.4/lib/node_modules/truffle/build/cli.bundled.js:284800:22)
at emitOne (events.js:116:13)
at Request.emit (events.js:211:7)
at Request.onRequestError (/home/chet/Hack/nodejs-8.9.4/lib/node_modules/truffle/build/cli.bundled.js:285492:8)
at emitOne (events.js:116:13)
at ClientRequest.emit (events.js:211:7)
at TLSSocket.socketErrorListener (_http_client.js:387:9)
at emitOne (events.js:116:13)
at TLSSocket.emit (events.js:211:7)