Don't read the changelog more than 1 time (when testing different encodings)

Author: jonoomph

src/windows/about.py

@@ -268,6 +268,7 @@ def __init__(self):
                                                    'date': line[9:20].strip(),
                                                    'author': line[20:45].strip(),
                                                    'subject': line[45:].strip() })
+                        break
                 except:
                     # Ignore decoding errors
                     pass