Add support for metadata with post requests

[relekang]

Excerpt from docs:

You can add more metadata to the view by posting a JSON payload with the field meta. Everything in that meta field will be set on meta in the view object. You can read the data out with the all option, see below for more info. Example request that will post the browser useragent string:

 <script>
   fetch('servicedomain.com' + window.location.pathname, {
     method: "POST",
     credentials: "include",
     headers: {"Content-Type": "application/json"},
     body: JSON.stringify({meta: { browser: navigator.userAgent }}),
   })
 </script>

[codecov-io]

Codecov Report

Merging #71 into master will increase coverage by 0.17%. The diff coverage is 88.23%.

@@            Coverage Diff             @@
##           master      #71      +/-   ##
==========================================
+ Coverage   75.28%   75.46%   +0.17%     
==========================================
  Files          10       10              
  Lines         259      269      +10     
  Branches       44       46       +2     
==========================================
+ Hits          195      203       +8     
- Misses         59       61       +2     
  Partials        5        5

Impacted Files	Coverage Δ
packages/micro-analytics-cli/src/handler.js	72.88% <88.23%> (+1.45%)	:arrow_up:

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[relekang]

That is a very good idea 😅

[relekang]

Updated the readme :v: