Some warnings

Just noting a few warnings I got while preparing the v9.9.0 release:

$ NODE_OPTIONS="--trace-warnings" changelog-maker --group --start-ref v9.8.0
(node:10896) [DEP0005] DeprecationWarning: The Buffer() and new Buffer() constructors are not recommended for use due to security and usability concerns. Please use the new Buffer.alloc(), Buffer.allocUnsafe(), or Buffer.from() construction methods instead.
    at showFlaggedDeprecation (buffer.js:139:13)
    at new Buffer (buffer.js:160:3)
    at BufferList.copy (/home/mzasso/.nvm/versions/node/v9.8.0/lib/node_modules/changelog-maker/node_modules/gitexec/node_modules/bl/bl.js:108:19)
    at BufferList.slice (/home/mzasso/.nvm/versions/node/v9.8.0/lib/node_modules/changelog-maker/node_modules/gitexec/node_modules/bl/bl.js:99:15)
    at BufferList.end (/home/mzasso/.nvm/versions/node/v9.8.0/lib/node_modules/changelog-maker/node_modules/gitexec/node_modules/bl/bl.js:89:31)
    at Socket.onend (_stream_readable.js:602:10)
    at Object.onceWrapper (events.js:272:13)
    at Socket.emit (events.js:185:15)
    at endReadableNT (_stream_readable.js:1101:12)
    at process._tickCallback (internal/process/next_tick.js:114:19)
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(node:10896) TimeoutOverflowWarning: 4294967296000 does not fit into a 32-bit signed integer.
Timer duration was truncated to 2147483647.
    at Object.exports.enroll (timers.js:407:13)
    at TLSSocket.Socket.setTimeout (net.js:369:12)
    at TLSSocket.<anonymous> (_http_client.js:725:14)
    at Object.onceWrapper (events.js:272:13)
    at TLSSocket.emit (events.js:185:15)
    at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1157:10)
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(node:10896) TimeoutOverflowWarning: 4294967296000 does not fit into a 32-bit signed integer.
Timer duration was truncated to 2147483647.
    at Object.exports.enroll (timers.js:407:13)
    at TLSSocket.Socket.setTimeout (net.js:369:12)
    at TLSSocket.<anonymous> (_http_client.js:725:14)
    at Object.onceWrapper (events.js:272:13)
    at TLSSocket.emit (events.js:185:15)
    at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1157:10)

Reproduce the warnings with NODE_OPTIONS="--trace-warnings" changelog-maker --group --start-ref v9.8.0. Start with the stack traces through gitexec and bl, then inspect the timeout path shown in _http_client.js; done means the reported warnings no longer appear during the changelog command.