Fix CI errors

CONTRIBUTING.rst

@@ -125,7 +125,7 @@ also create a proper pull request instead:
   (This is case sensitive. Use CamelCase.)
 * The picture should be 1200 pixels wide and square or not too far
   from square (3:4 is fine).
-* Minimize the file size by running it through `Tiny Png<https://tinypng.com/>`_
+* Minimize the file size by running it through `Tiny Png <https://tinypng.com/>`_
 * Place the file in *static/samples/*
 * Check if the picture shows up at the bottom of the settings page of
   the generator when running *scripts/boxesserver*

boxes/generators/typetray.py

@@ -236,7 +236,7 @@ def render(self):
         if hasattr(self, "label_text"):
             self.textcontent = self.label_text.split("\r\n")
         else:
-            with open(self.label_file, "r") as f:
+            with open(self.label_file) as f:
                 self.textcontent = f.readlines()
         self.textnumber = 0