Allow async handlers

[juliusza]

Allows route handlers to be async functions

Based on https://medium.com/@Abazhenov/using-async-await-in-express-with-node-8-b8af872c0016

Or see README for more info

[jsdevel]

FYI, express-openapi supports this.

[juliusza]

Thanks, I will look into that lib.

[juliusza]

Is there a reason not to accept this PR though ? express-openapi does not work out of the box for me, I'd rather stick with swaggerize-express

[jsdevel]

express-openapi does not work out of the box for me

@juliusza what issue were you having? Can you open one? https://github.com/kogosoftwarellc/express-openapi/issues

[juliusza]

ok, how about this one?
kogosoftwarellc/open-api#91

[tlivings]

Will review. Kraken team has been under a lot of resource constraints and it’s been hard to turn around PRs. Apologies.

[tlivings]

Can you add some tests?

[tlivings]

Also, for what it’s worth at this point https://github.com/krakenjs/hapi-openapi is more actively maintained. Unless you have some overriding preference for express applications.

[juliusza]

I hope test is satisfactory. Please also bump major version to 5.0.0, because this now requires native Promise support and might not work for very old nodejs versions.

Tests now require node v8 to run. But node 4.8.7 is enough for lib to work correctly.

[juliusza]

Also do you think you could bump enjoi version ?

krakenjs/swaggerize-routes#94

[tlivings]

I don't have much of an issue with this. @subeeshcbabu ?