Description/Steps to reproduce

The tests running with node 10 fail due to an update of memwatch-next.
See issue marcominetti/node-memwatch#39

The fix for a node 10 installation would be updating the dependency from

// compatible with node 6, 8
"memwatch-next":  "^0.2.0"

to

// compatible with node 10 only
"node-memwatch": "^1.0.0"

While that breaks the installation on nodejs 8

Expected result

CI passes for node 6,8,10

Additional information

To solve the installation error, we could either install the dependency programmatic according to the detected nodejs version, or find a module that replaces memwatch-next.