code style fixes

Merge pull request #160 from ValikoDorodnov/json_unescaped_unicode

Flags for json_encode() in \cebe\openapi\Writer::writeToJson()

added version annotation

Fix relative path generation on windows

Merge pull request #96 from yorickgirard/specify-exception-thrown

Add exception in readFromJsonFile

added cli option to inline references

fix #63

more memory for phpstan

cleanup fix for Unresolved reference while instantiating Encoding

PR #68

Merge pull request #59 from cebe/fix-writer-yaml-empty-array

Fix writing empty array to YAML

added test case for #54

it is a duplicate of #57

fixes #54