Merge pull request AtlassianPS#210 from lipkau/fix/AtlassianPS#209-In…

…dexIntoNullObject

Fix AtlassianPS#209 - Indexing into Null Object

Merge pull request AtlassianPS#207 from lipkau/fix/AtlassianPS#206-Fi…

…xEmptyHeader

Extract captcha test and fix empty headers AtlassianPS#206

Release v2.4

FEATURES:
  - `Add-JiraIssueAttachment`: Add an attachment to an issue (AtlassianPS#137, [@beaudryj][])
  - `Get-JiraIssueAttachment`: Get attachments from issues (AtlassianPS#137, [@beaudryj][])
  - `Remove-JiraIssueAttachment`: Remove attachments from issues (AtlassianPS#137, [@beaudryj][])

IMPROVEMENTS:
  - `JiraPS.Issue` now has a property for Attachments `JiraPS.Attachment` (AtlassianPS#137, [@beaudryj][])

Release of new minor version: JiraPS v2.3

Fix Header in Session creation

Merge pull request AtlassianPS#190 from lipkau/fix/AtlassianPS#185-He…

…aderIsMissingKey

Add a check that the header actually contains the key

Merge pull request AtlassianPS#191 from TomasDeceuninck/bugfix/Atlass…

…ianPS#183-and-AtlassianPS#184

Fix bugs AtlassianPS#183 and AtlassianPS#184

Merge pull request AtlassianPS#191 from TomasDeceuninck/bugfix/Atlass…

…ianPS#183-and-AtlassianPS#184

Fix bugs AtlassianPS#183 and AtlassianPS#184

Fix Tests by ensureing that the environment is setup correctly

Fix GitHub deployment