Updated to python3

Signed-off-by: Dimitris Zlatanidis <d.zlatanidis@gmail.com>

CONTRIBUTING

@@ -8,4 +8,4 @@ as important how a package is build.
 Small changes in the code each time more appreciated.
 Keep the style code applicable items.
 
-Please ensure your changes work in Python 2.7.5+
+Please ensure your changes work in Python >= 3.7

INSTALL.md

@@ -22,4 +22,4 @@ There are mainly 3 ways:
 2. Download binary package from '`https://sourceforge.net/projects/slpkg/files/binary/`'
    and use Slackware command '`upgradepkg --install-new <slpkg binary>`'
 
-3. Using pip: '`pip install https://gitlab.com/dslackw/slpkg/-/archive/3.7.0/slpkg-3.7.0.tar.gz`'
+3. Using pip: '`pip3 install https://gitlab.com/dslackw/slpkg/-/archive/3.7.0/slpkg-3.7.0.tar.gz`'

setup.py

@@ -65,6 +65,7 @@ setup(
     scripts=["bin/slpkg"],
     version=_meta_.__version__,
     description="Package manager for Slackware installations",
+    long_description=open("README.md").read(),
     keywords=["slackware", "slpkg", "upgrade", "install", "remove",
               "view", "slackpkg", "tool", "build"],
     author=_meta_.__author__,
@@ -84,6 +85,8 @@ setup(
         "Development Status :: 5 - Production/Stable",
         "Environment :: Console",
         "License :: OSI Approved :: GNU General Public License v3 (GPLv3)",
+
+
         "Operating System :: POSIX :: Linux",
         "Operating System :: Unix",
         "Programming Language :: Python :: 3",
@@ -92,8 +95,8 @@ setup(
         "Topic :: System :: Archiving :: Packaging",
         "Topic :: System :: Software Distribution",
         "Topic :: Utilities"],
-    long_description=open("README.md").read()
-    )
+    python_requires=">=3.7"
+)
 
 # Install configuration files with pip.
 if "install" in sys.argv: