Node v18 support

[mcollina]

When adding support to my module to Node v18, I had the following error:

node: symbol lookup error: /home/matteo/repositories/synchronous-worker/build/Release/synchronous_worker.node: undefined symbol: _ZN4node17CreateEnvironmentEPNS_11IsolateDataEN2v85LocalINS2_7ContextEEERKSt6vectorISsSaISsEESA_NS_16EnvironmentFlags5FlagsENS_8ThreadIdESt10unique_ptrINS_21InspectorParentHandleESt14default_deleteISF_EE

Note I have this error only on Linux and not on Mac.

[addaleax]

📦 synchronous-worker@1.0.5

[mcollina]

Thanks @addaleax! This is amazing!