Update main.py

Add wait for oemer

main.py

@@ -40,7 +40,8 @@ def convert_to_key():
 
 
 def run_oemer():
-    subprocess.run(['oemer', f'{DEFAULT_FILE_NAME}.png'])
+    process = subprocess.Popen(['oemer', f'{DEFAULT_FILE_NAME}.png'])
+    process.wait()
 
 def predict(inp):
     img = Image.fromarray(inp)