fix: missing encoding definition

examples/common.py

@@ -10,7 +10,7 @@ NLP: Language = spacy.load("hu_core_news_trf")
 
 def _compute_idf(freq_file: Path) -> Dict[str, float]:
     freqs: Dict[str, int] = {}
-    with freq_file.open() as f:
+    with freq_file.open(encoding="utf-8") as f:
         for line in f:
             line = line.strip()
             data: List[str] = line.split()