Loosen the numpy version restriction

Author: apockill

pyproject.toml

@@ -17,7 +17,7 @@ classifiers = [
 python = "^3.6"
 requests = "^2.24.0"
 pillow = "^7.2.0"
-numpy = "^1.19.1"
+numpy = "^1.16"
 dataclasses = { version = "^0.7", python = "~3.6" }
 
 [tool.poetry.dev-dependencies]