0.5.0: Enable VCL snippets (#26)

* feat: enable VCL snippets

* docs: add available parameters 4 VCL snippets

* test: add test for VCL snippets

* doc: enhance documentation 4 running tests

* add vcl_snippets integration tests

* align naming to naming coming from fastly API

* remove unnecessary test documentation

* update cassettes after successful test run

* fix: tests are green locally, updating cassettes

* remove crap from readme

* remove unused import

* update cassettes after removing unnecassary tests