Replace packaging with packvers

Reference: #95

Author: alok1304

requirements.txt

@@ -4,3 +4,4 @@ pyparsing==2.4.7
 semantic-version==2.8.5
 semver==2.13.0
 isort==5.10.1
+packvers==21.5

setup.cfg

@@ -59,7 +59,7 @@ python_requires = >=3.8
 
 install_requires =
     attrs
-    packaging
+    packvers
     semantic-version
     semver
 

src/univers/version_range.py

@@ -9,8 +9,8 @@
 
 import attr
 import semantic_version
-from packaging.specifiers import InvalidSpecifier
-from packaging.specifiers import SpecifierSet
+from packvers.specifiers import InvalidSpecifier
+from packvers.specifiers import SpecifierSet
 from semantic_version.base import AllOf
 from semantic_version.base import AnyOf
 

src/univers/versions.py

@@ -6,7 +6,7 @@
 
 import attr
 import semantic_version
-from packaging import version as packaging_version
+from packvers import version as packaging_version
 
 from univers import arch
 from univers import debian

tests/test_pypi_version.py

@@ -6,7 +6,7 @@
 
 from unittest import TestCase
 
-from packaging import version as packaging_version
+from packvers import version as packaging_version
 
 from univers.versions import InvalidVersion
 from univers.versions import PypiVersion