Switch to Hackage version of hstatistics

We were depending on Alexandre's fork of `hstatistics`, but in the
meantime his changes got merged upstream and the maintainer release
version `0.3.1` on Hackage, so this commit changes the `stack.yaml` file
to use that.

stack.yaml

@@ -32,6 +32,8 @@ ghc-options:
 #  "$everything": -haddock
 
 extra-deps:
+- hstatistics-0.3.1
+
 - git: https://gitlab.iscpif.fr/gargantext/haskell-gargantext-prelude.git
   commit: 791c2a7046a3760f8ae5fabdbd708f61caa63741
   #- git: https://gitlab.iscpif.fr/cgenie/haskell-gargantext-prelude
@@ -42,8 +44,6 @@ extra-deps:
   commit: 10a416b9f6c443866b36479c3441ebb3bcdeb7ef
 - git: https://gitlab.iscpif.fr/gargantext/hlcm.git
   commit: 6f0595d2421005837d59151a8b26eee83ebb67b5
-- git: https://github.com/delanoe/hstatistics.git
-  commit: 90eef7604bb230644c2246eccd094d7bfefcb135
 - git: https://github.com/paulrzcz/HSvm.git
   commit: 3fe28b683aba5ddf05e3b5f8eced0bd05c5a29f9