remove Markdown dep (#189)

Author: aplavin

Project.toml

@@ -10,7 +10,6 @@ Dates = "ade2ca70-3891-5945-98fb-dc099432e06a"
 InverseFunctions = "3587e190-3f89-42d0-90ee-14403ec27112"
 LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
 MacroTools = "1914dd2f-81c6-5fcd-8719-6d5c9610ff09"
-Markdown = "d6f4376e-aef5-505a-96c1-9c027394607a"
 Requires = "ae029012-a4dd-5104-9daa-d747884805df"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 
@@ -44,7 +43,6 @@ IntervalSets = "0.7"
 InverseFunctions = "0.1.5"
 LinearAlgebra = "1"
 MacroTools = "0.5"
-Markdown = "1"
 Requires = "0.5, 1.0"
 StaticArrays = "1"
 StructArrays = "0.6, 0.7"

src/Accessors.jl

@@ -2,7 +2,6 @@ module Accessors
 using MacroTools
 using MacroTools: isstructdef, splitstructdef, postwalk
 using InverseFunctions
-using Markdown: Markdown, @md_str, term
 
 if !isdefined(Base, :get_extension)
     using Requires
@@ -30,7 +29,7 @@ function __init__()
         Base.Experimental.register_error_hint(MethodError) do io, exc, argtypes, kwargs
             if exc.f === insert && argtypes[2] <: Accessors.DynamicIndexLens
                 println(io)
-                term(io, md"""
+                print(io, """
                    `insert` with a `DynamicIndexLens` is not supported, this can happen when you write
                    code such as `@insert a[end] = 1` or `@insert a[begin] = 1` since `end` and `begin`
                    are functions of `a`. The reason we do not support these with `insert` is that