Tasks are not removed from Vec in file upload example

[allsey87]

Problem
In the file upload example, tasks are never removed from tasks: Vec<ReaderTask>.

Steps To Reproduce
Study the code in the example

Expected behavior
The task should be removed once Msg::Loaded arrives at the component.

Environment:
Yew version: v0.18

[mc1098]

Thank you for the issue! ❤️

#2054 fixes the example for v0.18 :)
The same issue still exists in master so #2055 will fix that and close this issue 🎉