Replace parse with a simple regex.

This makes parse obsolete, removing ~1000 LOC.

pipenv/utils/internet.py

@@ -2,7 +2,6 @@ import re
 from urllib.parse import urlparse
 
 from pipenv.patched.pip._vendor.urllib3 import util as urllib3_util
-from pipenv.vendor import parse
 
 requests_session = None  # type: ignore
 
@@ -121,6 +120,8 @@ def proper_case(package_name):
     if not r.ok:
         raise OSError(f"Unable to find package {package_name} in PyPI repository.")
 
-    r = parse.parse("https://pypi.org/pypi/{name}/json", r.url)
-    good_name = r["name"]
+    regex = r"https://pypi\.org/pypi/(.*)/json$"
+    match = re.search(regex, r.url)
+    good_name = match.group(1)
+
     return good_name