Update Cake.Core to 1.1

[michalsteyn]

The current version of Cake.Paket (4.0.0) is no longer compatible with the latest version of Cake.
This PR simply updates the Cake.Paket to v1.1 of Cake.Core.

[codecov]

Codecov Report

Merging #35 (5786fbc) into master (b1830ef) will not change coverage.
The diff coverage is n/a.

❗ Current head 5786fbc differs from pull request most recent head 27a7961. Consider uploading reports for the commit 27a7961 to get more accurate results

@@           Coverage Diff           @@
##           master      #35   +/-   ##
=======================================
  Coverage   47.66%   47.66%           
=======================================
  Files          11       11           
  Lines         472      472           
  Branches       70       70           
=======================================
  Hits          225      225           
  Misses        226      226           
  Partials       21       21           

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