Update dependencies version up and fix the test codes

[boring-km]

Hello, I'm using this package and I have an issue to update http package version in my project.

Issue

Here is the error when I run pub get

Because metadata_fetch 0.4.1 depends on http ^0.13.3 and no versions of metadata_fetch match >0.4.1 <0.5.0, metadata_fetch ^0.4.1 requires http ^0.13.3.
So, because ac_project_app depends on both http ^1.0.0 and metadata_fetch ^0.4.1, version solving failed.

Suggestion

Please update dependencies version especially http.

Thank you :)

[Thelm76]

+1 this is very useful, we need to get latest dependencies compatibility.
@boring-km If you want you can set `http: ">=0.13.5 <2.0.0" to keep compatibility with http 0.13

[martnst]

friendly reminder :)