Fix for unsecure host get parsed.hostname instead of parsed.netloc (#397)

poetry/installation/pip_installer.py

@@ -30,10 +30,10 @@ class PipInstaller(BaseInstaller):
             if parsed.scheme == "http":
                 self._io.write_error(
                     "    <warning>Installing from unsecure host: {}</warning>".format(
-                        parsed.netloc
+                        parsed.hostname
                     )
                 )
-                args += ["--trusted-host", parsed.netloc]
+                args += ["--trusted-host", parsed.hostname]
 
             auth = get_http_basic_auth(package.source_reference)
             if auth: