Merge pull request pypa#2305 from dstufft/remove-warning

Remove a no longer needed warning due to the update of PEP 440
(cherry picked from commit 2e02c0a)

pip/index.py

@@ -461,18 +461,6 @@ def mkurl_pypi_url(url):
             return None
 
         if not applicable_versions:
-            # The following check for '>' is designed to prevent confusion like
-            # that in
-            # https://bitbucket.org/pypa/setuptools/issue/301/101-in-requirementparse-foo-10-results
-            str_specifier = str(req.specifier)
-            if '>' in str_specifier and '>=' not in str_specifier:
-                logger.warning(
-                    "The behavior of the `>` version specifier has changed in "
-                    "PEP 440. `>` is now an exclusive operator, meaning that "
-                    "%s does not match %s. "
-                    "Perhaps you want `>=` instead of `>`?",
-                    str_specifier, str_specifier + '.*'
-                )
             logger.critical(
                 'Could not find a version that satisfies the requirement %s '
                 '(from versions: %s)',