Tag v1, write JOSS paper?

[dlfivefifty]

@jishnub I've started tagging v1 for a bunch of packages. ApproxFun hasn't had a breaking version in almost 2 years, maybe its time to tag v1.0?

We could also write a joint JOSS paper?

[jishnub]

I think we can take this opportunity to formalize the exported functions. Currently, we have

ApproxFun.jl/src/ApproxFun.jl

Lines 8 to 11 in e7b9459

	@reexport using ApproxFunBase
	@reexport using ApproxFunFourier
	@reexport using ApproxFunOrthogonalPolynomials
	@reexport using ApproxFunSingularities

which means that breaking changes to these sub-packages may become a breaking change in ApproxFun, even though the breakage might be an implementation detail that is inadvertently exposed to the user through the re-exports. I'll try to get this done over the next week. Once we have a concrete list of exported functions, we can certainly tag v1, as the top-level API is stable.

I'm also up for writing a JOSS paper, and it would be good to have a canonical reference describing the software that is complementary to the various references describing the math.