disabled the CURLOPT_ENCODING setting for avoind the #79, #83

Initialize typed property "labels" so it can be accessed even if empty (

#69)

* Update IssueField.php

Fix "Typed property JiraCloud\Issue\IssueField::$labels must not be accessed before initialization" when trying to access labels of a retrieved issue.

* Update IssueField.php

Remove whitespace in a blank line

Allow NULL for setParent (#61)

fixed upload attachment failed - #59

Apply fixes from StyleCI (#56)

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Apply fixes from StyleCI (#45)

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Apply fixes from StyleCI (#44)

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Apply fixes from StyleCI (#43)

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fixed #31 $environment type to array.

Apply fixes from StyleCI (#33)

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