fix: requirements.txt

requirements.txt

@@ -3,7 +3,7 @@ bcrypt>=3.2,<3.3
 black
 cleo>=0.8.1,<0.9
 cryptography>=3.3.1,<4.0
-dotty_dict>=1.3.0<1.40
+dotty_dict>=1.3.0,<1.40
 exceptionite>=2.0,<3
 hashids>=1.3,<1.4
 hfilesize>=0.1