Fix electron stability by switching from nan to node-addon-api

[McShelby]

Fixes #176

[yanyiwu]

If it is merged, it may cause the version below 7.0.0 to fail. Are there many people using nodejs versions below 7.0?

[McShelby]

Hard to tell.

I see your module used as dependency for a lot of other chinese related node modules. That makes the impact hard to predict.

Node 6 was an LTS release and is unsupported since 2019-04-30.
Node 7 is from late 2016.
Current Node LTS is 14.x
Electron 10 is using 12.x
Electron 8 (as used in VSCode) is also using 12.x

For me, this seems worth the risk.

[yanyiwu]

Thank you very much. If you are also a cryptocurrency enthusiast, for example, if you have an EOS account, I hope to transfer a little EOS tokens through the blockchain to express my gratitude forever.

[yanyiwu]

https://travis-ci.org/github/yanyiwu/nodejieba/builds/744923635

@McShelby after i taged v2.5.0 , it failed. it is weird because the code is unchanged. can you help to find out what's the problem ?

[McShelby]

Seariously puzzling. It may have something to do with the --fallback-to-build switch. But at the moment I am only guessing.

I was already wondering, that it worked with Node 7.1.0. I did not expect this. Now with this error, I have the fealing, that the travis job of my bugfix branch was using the precompiled version but did not run the compile at all.