[PATCH 1 of 6] setup.py: allow Paste 3.0.x

[Thomas De Schampheleire]

# HG changeset patch
# User Thomas De Schampheleire <thomas.de_schampheleire at nokia.com>
# Date 1546030612 -3600
#      Fri Dec 28 21:56:52 2018 +0100
# Node ID 43b3bbf90a48adfcfb4837655cffee3a939bf48f
# Parent  445d6875c2eefdd8d10676e761cfe1e82581f78a
setup.py: allow Paste 3.0.x

In a fresh virtualenv on the stable branch, pastescript 3.0.0 is installed
which depends on paste 3.0.x. Using this virtualenv to upgrade to the
default branch, using 'pip install --upgrade -e .' fails because on the
default branch, the paste version is restricted with '>= 2.0.3, < 3'.
Following error occurs:

pastescript 3.0.0 has requirement Paste>=3.0, but you'll have paste 2.0.3 which is incompatible.
...
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/home/tdescham/repo/contrib/kallithea/kallithea-release/setup.py", line 160, in <module>
        """,
      File "/usr/lib64/python2.7/distutils/core.py", line 151, in setup
        dist.run_commands()
      File "/usr/lib64/python2.7/distutils/dist.py", line 953, in run_commands
        self.run_command(cmd)
      File "/usr/lib64/python2.7/distutils/dist.py", line 972, in run_command
        cmd_obj.run()
      File "/home/tdescham/repo/contrib/kallithea/venv/kallithea-release/lib/python2.7/site-packages/setuptools/command/develop.py", line 36, in run
        self.install_for_development()
      File "/home/tdescham/repo/contrib/kallithea/venv/kallithea-release/lib/python2.7/site-packages/setuptools/command/develop.py", line 117, in install_for_development
        self.run_command('egg_info')
      File "/usr/lib64/python2.7/distutils/cmd.py", line 326, in run_command
        self.distribution.run_command(command)
      File "/usr/lib64/python2.7/distutils/dist.py", line 972, in run_command
        cmd_obj.run()
      File "/home/tdescham/repo/contrib/kallithea/venv/kallithea-release/lib/python2.7/site-packages/setuptools/command/egg_info.py", line 270, in run
        ep.require(installer=installer)
      File "/home/tdescham/repo/contrib/kallithea/venv/kallithea-release/lib/python2.7/site-packages/pkg_resources/__init__.py", line 2307, in require
        items = working_set.resolve(reqs, env, installer)
      File "/home/tdescham/repo/contrib/kallithea/venv/kallithea-release/lib/python2.7/site-packages/pkg_resources/__init__.py", line 854, in resolve
        raise VersionConflict(dist, req).with_context(dependent_req)
    pkg_resources.VersionConflict: (Paste 2.0.3 (/home/tdescham/repo/contrib/kallithea/venv/kallithea-release/lib/python2.7/site-packages), Requirement.parse('Paste>=3.0'))


The '< 3' restriction is introduced with commit
e1ab826131334150b1f003e26de3207c34fc6e67 in January 2017, at which point
2.0.3 was the latest version. Version 3.0.0 was introduced in October 2018.

diff --git a/setup.py b/setup.py
--- a/setup.py
+++ b/setup.py
@@ -59,7 +59,7 @@ requirements = [
     "dulwich >= 0.14.1, < 0.20",
     "mercurial >= 4.1.1, < 4.9",
     "decorator >= 3.3.2, < 4.4",
-    "Paste >= 2.0.3, < 3",
+    "Paste >= 2.0.3, < 3.1",
     "bleach >= 3.0, < 3.1",
     "Click >= 7.0, < 8",
 ]