simplify required python versions to avoid confusing poetry resolver

Author: purificant

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "python-paseto"
-version = "0.5.1"
+version = "0.5.2-alpha"
 description = "Platform-Agnostic Security Tokens for Python"
 authors = []
 license = "MIT"
@@ -20,7 +20,7 @@ classifiers = [
 ]
 
 [tool.poetry.dependencies]
-python = ">=3.6.2,<3.11"
+python = "^3.6"
 pysodium = "^0.7.10"
 
 [tool.poetry.dev-dependencies]