Please update http dependency

[pyxiscloud]

Hi,
In my project with casdoor SDK, can't update http package version:
Because casdoor_flutter_sdk 1.5.0 depends on http >=0.13.4 <1.0.0 and no versions of casdoor_flutter_sdk match >1.5.0 <2.0.0, casdoor_flutter_sdk ^1.5.0 requires http >=0.13.4 <1.0.0. So, because flutterweb depends on both http ^1.2.1 and casdoor_flutter_sdk ^1.5.0, version solving failed.
Please use newer version of http?
Thank you

[casbin-bot]

@tangyang9464 @JalinWang @imp2002

[hsluoyz]

Fixed by: #42