adds option to pass middleware

[vajahath]

This PR enable users to pass a middleware along with options object.

If I want to protect the appmetrics dash, pass a middleware like:

const options = {
  ...
  middleware: (req, res, next)=>{
    // do stuff to protect
    return next()
  }
  ...
}

attach(options);

[codecov-io]

Codecov Report

Merging #150 into master will increase coverage by 2.37%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #150      +/-   ##
==========================================
+ Coverage   63.17%   65.54%   +2.37%     
==========================================
  Files           4        4              
  Lines         410      415       +5     
==========================================
+ Hits          259      272      +13     
+ Misses        151      143       -8

Impacted Files	Coverage Δ
lib/appmetrics-dash.js	62.66% <100%> (+3.68%)	:arrow_up:
lib/classes/collections.js	64% <0%> (-2%)	:arrow_down:

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[tobespc]

Hi @vajahath before we can accept this, please can you read https://github.com/RuntimeTools/appmetrics-dash/blob/master/CONTRIBUTING.md and add your name to the authors file .

Can you also provide an example of a testcase using this function.

Thanks, Toby

[vajahath]

@tobespc done a few things. please verify :)

[tobespc]

looks good, I'll run some tests and then accept it

[vajahath]

@tobespc when can I expect the push to npm ?

[tobespc]

Just need to work through a few internal release checks first but I would hope it goes today

[tobespc]

@vajahath appmetrics-dash 4.0.0 is now on npm with your change in. Thanks for the work you did on this