[caribou] tools: Assume 'UTF-8' for the output schema file

[Daiki Ueno <dueno src gnome org>]

commit e5375dc19f2ca404e1c70081ac6eea4c5119460b
Author: Daiki Ueno <dueno src gnome org>
Date:   Mon Feb 20 11:15:40 2017 +0100

    tools: Assume 'UTF-8' for the output schema file

 tools/make_schema.py |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/tools/make_schema.py b/tools/make_schema.py
index 2d409f7..84665d6 100755
--- a/tools/make_schema.py
+++ b/tools/make_schema.py
@@ -2,7 +2,7 @@
 
 import xml.dom.minidom
 
-import os, sys
+import io, os, sys
 sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 
 from caribou.settings import caribou_settings
@@ -21,7 +21,7 @@ class SchemasMaker:
         schemafile.appendChild(schema)
         self._create_schema(self.settings, doc, schema)
 
-        fp = open(output, 'w')
+        fp = io.open(output, 'w', encoding='UTF-8')
         self._pretty_xml(fp, schemafile)
         fp.close()