Update devDependencies to latest versions #49
Merged
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Cannot update chai to 4.2.0 as the new proxies used for property access are not compatible with the current test environment.
Leaving gulp at stable 3.9.1 release rather than 'next' 4.0.0 which has breaking changes.
Note phantomjs, used by gulp-mocha-phantomjs and jshint has no ongoing development so should probably get replaced later: ariya/phantomjs#15344