Update app.py

app.py

@@ -28,7 +28,7 @@ def preprocess_text(x):
   x = re.sub(r"@\S+", " ", x)  # mentions
   x = re.sub(r"#\S+", " ", x)  # hastags
   x = re.sub(r"\s{2,}", " ", x)  # over spaces
-  #x = re.sub("[^.,!?A-Za-z0-9]+", " ", x)  # special charachters except .,!?
+  x = re.sub("[^.,!'?A-Za-z0-9]+", " ", x)  # special charachters except .,!?
 
   return x