Upper bound DiffEqBase and ExponentialUtilities

[devmotion]

Add semver compatible upper bounds for DiffEqBase and ExponentialUtilities (see https://julialang.github.io/Pkg.jl/v1/compatibility/#Version-specifier-format-1).

Should we do the same even for dependencies with 0.x version numbers? And should we update the registry for old releases?

[ChrisRackauckas]

Past versions need the upper bound too. @StefanKarpinski what's the right way to do that with the new registry setup?

[StefanKarpinski]

Make a PR to the registry editing the Compat.toml files there by hand.

[coveralls]

Coverage increased (+0.06%) to 80.824% when pulling 4dc9e1a on upperbound into e46c08b on master.

[coveralls]

Coverage remained the same at 80.76% when pulling 8513811 on upperbound into e46c08b on master.

[codecov]

Codecov Report

Merging #891 into master will decrease coverage by 0.07%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #891      +/-   ##
==========================================
- Coverage   80.09%   80.01%   -0.08%     
==========================================
  Files          92       92              
  Lines       30411    30461      +50     
==========================================
+ Hits        24357    24374      +17     
- Misses       6054     6087      +33

Impacted Files	Coverage Δ
src/solve.jl	72.88% <0%> (-19.6%)	⬇️
src/integrators/integrator_utils.jl	86.72% <0%> (+0.82%)	⬆️
src/caches/kencarp_kvaerno_caches.jl	97.02% <0%> (+0.99%)	⬆️
src/perform_step/sdirk_perform_step.jl	79.29% <0%> (+1.51%)	⬆️
src/dense/rosenbrock_interpolants.jl	94.59% <0%> (+5.4%)	⬆️

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[devmotion]

Should we also drop support for old versions of StaticArrays and DataStructures?

[ChrisRackauckas]

I think so. At whatever point they put the 1.0 we should go with that, but until then we just stay up to date.

[devmotion]

@ChrisRackauckas Good to merge now?

[ChrisRackauckas]

Yes, but without editing the Compat.toml we cannot tag.