fixed json mapping failed on DateTimeInterface field

see #212 #216

Use DateTimeInterface instead of DateTime

• Use DateTimeInterface instead of DateTime(see #212)
• Updated documentation(see #213 )

[NEW] some new functionality for Version

add new functionality for Version

• See #202 , #203, #204

add laravel package auto discover support

• See #205

[NEW] create project function.

see #195

attachment save directory recursively created.

see #187

fixed Null Configuration Object bug.

1.30.2

fixed #175 DotEnvConfiguration null object access.

fixed ArrayConfiguration error.

see #175

proxy support, remote issue link delete

see #186 , #185

fixed worklog setVisibility bug.

see #180

Support for "unassigned" Issues

• See #177
• See #178