Makefile: force C.UTF-8 locale

Fixes a Click / Python3 problem:

RuntimeError: Click will abort further execution because Python 3 was
  configured to use ASCII as encoding for the environment. Either switch
  to Python 2 or consult http://click.pocoo.org/python3/ for
  mitigation steps.

1 files changed, 1 insertions, 1 deletions

diff --git a/Makefile b/Makefile
index af469c8..af4eb28 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
 all:
 	git pull
-	mkdocs build --clean 2>&1 | grep -v "Warning: Click detected the use of the unicode_literals"
+	LC_ALL=C.UTF-8 LANG=C.UTF-8 mkdocs build --clean
 	cp -af htaccess site/.htaccess
 
 .PHONY: clean