Drop support for Julia versions <v1.6 (#239)

* Drop support for Julia versions <v1.6

* update Julia version in CI

* drop oneto compat for Julia <v1.6

Author: jishnub

.github/workflows/ci.yml

@@ -27,7 +27,7 @@ jobs:
       fail-fast: false
       matrix:
         version:
-          - '1.5'
+          - '1.6'
           - '1'
         os:
           - ubuntu-latest

Project.toml

@@ -44,7 +44,7 @@ LazyArrays = "0.20, 0.21, 0.22"
 LowRankApprox = "0.2, 0.3, 0.4, 0.5"
 SpecialFunctions = "0.10, 1.0, 2"
 StaticArrays = "0.12, 1.0"
-julia = "1.5"
+julia = "1.6"
 
 [extras]
 Aqua = "4c88cf16-eb10-579e-8560-4a9242c79595"

src/ApproxFunBase.jl

@@ -95,12 +95,7 @@ export pad!, pad, chop!, sample,
 
 export .., Interval, ChebyshevInterval, leftendpoint, rightendpoint, endpoints, cache
 
-
-if VERSION < v"1.6-"
-	oneto(n) = Base.OneTo(n)
-else
-	import Base: oneto
-end
+import Base: oneto
 
 # assert that the conversion succeeds. This helps with inference as well as sanity
 strictconvert(T::Type, x) = convert(T, x)::T