applied nullable field.

1.7.0

fixed #32

fixed JiraException Class typo

1.6.3

Merge branch 'feature/exception-class-case-typo' into develop

remove constant dependent on 5.6

1.6.2

add serialized data test case

fixed misusing phpdotenv 2.0

1.6.1

fixed #25 bug

update dependent on phpdotenv 2.0 for laravel 5.2

1.6.0

Merge branch 'develop'

1.5.2

Merge pull request #24 from stmh/master

Fix missing comments due to a misnamed key.

allow empty assignee.

fixed #17 , #18

add worklog

1.5.0

fixed typo

revert from #14

1.4.1

revert from #14

rename worklog to timeTracking

1.4.0

Merge branch 'develop'