Drop support for versions below Node.js 6

[Siilwyn]

Something for the future, I was looking into reducing my CLI tool size and noticed the semver package at the top when sorting by size.

When going with Node.js 6 and higher two dependencies, semver and nice-try are not needed anymore since they are used only once for feature detection here:

node-cross-spawn/lib/parse.js

Line 15 in bbd342b

const supportsShellOption = niceTry(() => semver.satisfies(process.version, '^4.8.0 || ^5.7.0 || >= 6.0.0', true)) || false;

[satazor]

Node 6 is reaching EOL in April. In May, I will remove both node 4 and 6 support in a single release.

[ehmicky]

@satazor, any news on this? Thanks!

[satazor]

It’s time to remove support for older Node versions. @Siilwyn @ehmicky want to give this a try?

[Siilwyn]

@satazor #125

[satazor]

#125 was merged!

[satazor]

I will release a new version in the next hours.