[gspell/wip/enchant2] Use Enchant 2

[Sébastien Wilmet <swilmet src gnome org>]

commit 28fd5613f7244b45ab7c0ef562c1230f6eb49b73
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Fri Nov 24 15:34:52 2017 +0100

    Use Enchant 2
    
    Enchant has a new maintainer and the project is again under development.
    
    There has been some API/ABI breaks in Enchant 2, but they don't affect
    gspell.
    
    Unfortunately Enchant 2 is not parallel-installable with Enchant 1.
    Distribution packagers: good luck.

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 2e415c4..a68bda2 100644
--- a/configure.ac
+++ b/configure.ac
@@ -50,7 +50,7 @@ GSPELL_API_VERSION=1
 AC_SUBST(GSPELL_API_VERSION)
 
 # Dependencies
-enchant_req=1.6.0
+enchant_req=2.0
 glib_req=2.44
 gtk_req=3.20