update docs dependencies (#868)

* update docs dependencies

* fix imports

* compat for ApproxFun

Author: jishnub

docs/Project.toml

@@ -10,7 +10,11 @@ SpecialFunctions = "276daf66-3868-5448-9aa4-cd146d93841b"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 
 [compat]
+ApproxFun = "0.13"
+BandedMatrices = "0.17"
 Documenter = "0.27"
+DomainSets = "0.6"
 Literate = "2"
 Plots = "1"
 SpecialFunctions = "2"
+julia = "1.6"

docs/make.jl

@@ -1,5 +1,6 @@
-using Documenter, ApproxFun, BandedMatrices, DomainSets, LinearAlgebra
+using Documenter
 using Literate
+using ApproxFun, DomainSets, LinearAlgebra, BandedMatrices # these packages are needed for the docs library
 
 # Generate examples using Literate
 # See https://github.com/fredrikekre/Literate.jl/blob/master/docs/make.jl