fixed + completed type hints

main.py

@@ -1,12 +1,13 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 
+from __future__ import annotations
+
 import argparse
 import os
 
 from schema import InstructionSetSchema
 
-
 description = """Examples:
     - Default theme (black on white):
         python main.py schema.xml -o out.jpg
@@ -25,7 +26,7 @@ description = """Examples:
 """
 
 
-def processFile(inPath, outPath, confPath, display):
+def processFile(inPath: str, outPath: str, confPath: str, display: bool) -> None:
     schema = InstructionSetSchema(inPath, confPath, display)
     schema.save(outPath)
 
@@ -66,4 +67,4 @@ if __name__ == "__main__":
         if output is None:
             output = os.path.splitext(args.schema)[0] + ".png"
         
-        processFile(args.schema, output, args.config, args.display)
+        processFile(args.schema, output, args.config, args.display)