Update compat

[JeffFessler]

Thanks for accepting the previous PR. Unfortunately when I added the [compat] section I forgot to do a package update first, so I ended up pinning things to old versions of the packages, which then causes problems when trying to use this package with others. This PR simply updates the [compat] section to the latest versions of all the relevant packages.
Frankly I don't really understand why upper bounds in compat are required now, so I am not 100% sure that I have done this in the best way here. The good news at least it seems to pass the tests with the current versions of the included packages.

[coveralls]

Coverage remained the same at 90.283% when pulling a8995f5 on JeffFessler:master into 7f2da5b on JuliaDSP:master.

[JeffFessler]

So this update passes Julia 1.4 but fails tests for earlier versions of Julia.
I guess one or more of the other packages must require Julia 1.4.
My view is that there is little point in supporting old versions of Julia with this update of Wavelets.jl (people using older versions of Julia can use earlier releases of this package) so I have removed the tests of older versions from the CI file. Maybe there is some way to support both but I don't know how...

[johnnychen94]

The test fails because you have Manifest.toml checked in, those *_jll packages are artifacts and is not compatible to Julia < 1.3

Once Manifest.toml is removed, it should be good.

[johnnychen94]

Just some random comment on the Project.toml without any knowledge about the status of Wavelets.jl

Would be good to also add Manifest.toml to .gitignore file

[johnnychen94]

Approval for the content of Project.toml, whether these versions are valid in Wavelet.jl is out of my knowledge.

[JeffFessler]

Thanks to @johnnychen94's help, the tests now pass so this is ready for @gummif to review.

[gummif]

Thanks