uri_reference.is_valid() accepts invalid hostnames and out-of-range ports #138

The validator returns True for inputs that violate URI rules.

Examples:

In [15]:  uri_reference('google.com/path').is_valid()
Out[15]: True

In [27]:  uri_reference('http://example.com:99999/').is_valid()
Out[27]: True

Expected behavior:

The validator should reject missing schemes when a hostname is present
and should reject port values greater than 65535.

Actual behavior:

is_valid() returns True for both invalid inputs.

Steps to reproduce:

1. Run the two example expressions in a Python REPL.
2. Observe that both return True.

Environment:

Library version:
Python version: Python 3.10.14
OS: Windows

Fix? :

• Add port range validation and treat bare hostnames with paths as invalid
• unless explicitly allowed by the spec.