Removed dependency on cURL

[dmromanov]

CURL is a nice PHP extension, but if it is not present in a target system, it causes a lot of problems.

[codecov-io]

Current coverage is 81.32% (diff: 94.44%)

Merging #8 into master will decrease coverage by 0.20%

@@             master         #8   diff @@
==========================================
  Files             8          8          
  Lines          1283       1269    -14   
  Methods          52         52          
  Messages          0          0          
  Branches          0          0          
==========================================
- Hits           1046       1032    -14   
  Misses          237        237          
  Partials          0          0          

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[peter279k]

Hi @dmromanov, this PR is good, but the composer.json is conflicted.

Could you fix this :)?

[dmromanov]

Will do this in the next two weeks.

[peter279k]

Thank you, @dmromanov :smile:.

[dmromanov]

This is a kindly reminder that the PR was updated.