[PATCH evolve-ext] exthelper: drop Mercurial 4.3 support

[Matt Harbison]

On Sat, 10 Nov 2018 23:57:39 -0500, Matt Harbison <mharbison72 at gmail.com>  
wrote:

> # HG changeset patch
> # User Matt Harbison <matt_harbison at yahoo.com>
> # Date 1541912086 18000
> #      Sat Nov 10 23:54:46 2018 -0500
> # Node ID 58afc797eaeba9c1d20e41fc832d70aef0f0e6b2
> # Parent  2d9902f0ff175ff5e1baa4a4d8f7f37c7c9c7bf5
> exthelper: drop Mercurial 4.3 support

Gentle ping on this.