Updated project to state support from Python v3.6+

Author: madpah

pyproject.toml

@@ -6,7 +6,7 @@ authors = ["Paul Horton <[email protected]>"]
 license = "Apache-2.0"
 
 [tool.poetry.dependencies]
-python = "^3.7"
+python = "^3.6"
 packageurl-python = "^0.9.4"
 requirements_parser = "^0.2.0"
 setuptools = "^50.3.2"

setup.py

@@ -29,7 +29,7 @@
         'Programming Language :: Python :: 3'
     ],
     packages=find_packages(),
-    python_requires='>=3.7',
+    python_requires='>=3.6',
     package_data={
         'cyclonedx': ['schema/*.json', 'schema/*.xsd', 'schema/ext/*.json', 'schema/ext/*.xsd']
     },