Julia 1.0 compat

[fonsp]

After Roger-luo/ExproniconLite.jl#2, this package is already compatible with Julia 1.0. I changed the config bound to "1", and after Roger-luo/ExproniconLite.jl#2 is released, Julia's package manager will automatically make sure that 1.0 users get the working combination of packages.

Tests on 1.0 will fail right now, because Roger-luo/ExproniconLite.jl#2 is not yet released, so the dependency cannot be resolved.

[codecov]

Codecov Report

Merging #37 (3dc366e) into master (8d71fd7) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #37   +/-   ##
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  Coverage   92.93%   92.93%           
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  Files           8        8           
  Lines         382      382           
=======================================
  Hits          355      355           
  Misses         27       27           

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[Roger-luo]

While fixing 1.0 compat issue in Expronicon, I was actually wondering about whether to support 1.0 and when do we drop 1.0 support - although Julia itself has a 1.0 LTS promise, it becomes harder and harder to support 1.0 with new compilation features for packages like Expronicon, and 1.0 has various issues when someone works with the compiler internals. This also happens to Expronicon, the generated code from @switch actually doesn't work in 1.0 somehow due to an undefined SSA variable error.

And I think, in fact, a lot of packages dropped 1.0 support a while ago, e.g most of the SciML packages only support 1.3+. Would it be a good idea to drop 1.0 support after the next LTS release? I'm wondering what would be the plan on Pluto side?

I'm releasing a schema checker package based on Configurations: https://github.com/Roger-luo/KungIChi.jl, and I'm planning not to support versions less than 1.6.

[fonsp]

Thanks! I try to support 1.0 for as long as possible, but I hope 1.6 will become LTS