Freeze IntervalArithmetic v0.20 in /docs

[schillic]

This is an attempt to prevent CompatHelper from bumping the version as in #141. IntervalArithmetic v0.21 would require changes to the docstrings, so this version should be mutually exclusive with v0.20. But currently, v0.21 is incompatible with many dependencies, so it cannot be used.

[lucaferranti]

from Pkg.jl documentation https://pkgdocs.julialang.org/v1/compatibility/

Caret specifiers are the default and hence 1.2.3 == ^1.2.3.

so I am not sure this is doing what you think, since it's not changing anything

I am not sure if there's a way to tell compat-helper to black list some packages, I'll ask on slack

[lucaferranti]

I think it's not possible atm: JuliaRegistries/CompatHelper.jl#404

[schillic]

I know, but it seems that for CompatHelper, these things differ. In your linked issue, the developer even says that. So let us just try. I will merge and tomorrow we see if there is a new PR.

[lucaferranti]

yes, but in the linked issue, the suggestion is

[compat]
Foo = ">= 1.2.3"

which is unbounded above, that is every version in the range [1.2.3, Inf] is alrady compatible, which is why CompatHelper does not open the PR, because every new version is already automatically compatible

[schillic]

There is another issue where the bound was ~ and it was not supposed to update. It was marked as a bug, so this is indeed the intended behavior. I guess the same is true for ^.

Patience... :)