Drop support for Julia versions <v1.6 (#127)

* Drop support for Julia versions <v1.6

* update Julia version in CI

* drop oneto compat for Julia <v1.6

* lower precision on v1.6 in Chebyshev large intervals test

Author: jishnub

.github/workflows/ci.yml

@@ -25,7 +25,7 @@ jobs:
       fail-fast: false
       matrix:
         version:
-          - '1.5'
+          - '1.6'
           - '1'
         os:
           - ubuntu-latest

Project.toml

@@ -34,7 +34,7 @@ FillArrays = "0.11, 0.12, 0.13"
 IntervalSets = "0.5, 0.6, 0.7"
 Reexport = "0.2, 1"
 SpecialFunctions = "0.10, 1.0, 2"
-julia = "1.5"
+julia = "1.6"
 
 [extras]
 Aqua = "4c88cf16-eb10-579e-8560-4a9242c79595"

test/ChebyshevTest.jl

@@ -163,7 +163,10 @@ import ApproxFunOrthogonalPolynomials: forwardrecurrence
 
         x = Fun(identity,0..100)
         f = sin(x^2)
-        @test ≈(f(.1),sin(.1^2);atol=1E-12)
+        # precision bug on v1.6 on Windows
+        windowsv16 = v"1.6" <= VERSION < v"1.7" && Sys.iswindows()
+        atol_test = windowsv16 ? 1E-11 : 1E-12
+        @test ≈(f(.1),sin(.1^2);atol = atol_test)
     end
 
     @testset "Reverse" begin

test/MultivariateTest.jl

@@ -4,11 +4,7 @@ import ApproxFunBase: testbandedblockbandedoperator, testraggedbelowoperator, fa
                     testblockbandedoperator
 import ApproxFunOrthogonalPolynomials: chebyshevtransform
 
-if VERSION < v"1.6-"
-	oneto(n) = Base.OneTo(n)
-else
-	import Base: oneto
-end
+import Base: oneto
 
 @testset "Multivariate" begin
     @testset "Square" begin