fixed convert int

Author: prStudentka

gendiff/formater/to_plain.py

@@ -1,12 +1,14 @@
 def convert(elem):
     if not isinstance(elem['value'], list):
         value = elem['value']
-        if type(value) in (int, float, str):
-            return f"'{value}'"
+        if type(value) in (int, float):
+            return value
         if type(value) == bool:
             return str(value).lower()
         if value is None:
             return "null"
+        if type(value) == str:
+            return f"'{value}'"
     return '[complex value]'