Set utf-8 as an encoding for open()

Not every system uses 'utf-8' as a default encoding for opening files in Python.

Before you say that there must be a way to set default encoding in one line, no, there is not. At least, I didn't found a way to do this.

dev/mvt-android

@@ -6,6 +6,10 @@
 
 import os
 import sys
+import importlib
+
+importlib.reload(sys)
+print(sys.getdefaultencoding())
 
 sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))