docs(readme): drop sort=semver from release badge — shields.io was rendering it as "invalid"

The "release: invalid" + intermittent "downloads: invalid" rendering on the README badges (user-reported screenshot) traced to shields.io's GitHub release endpoint choking on `?sort=semver`. Bisected via curl — every variant with sort=semver returned `aria-label="release: invalid"`, dropping it returned the correct version.

Default ordering on shields.io's `/github/v/release/{owner}/{repo}` is "latest published release" which already gives us what we want (our tags are linear v1.x.y semver and the most-recent is always the latest release). Also bumped the badges with explicit colors so they match the rest of the badge row visually.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: therealaleph

README.md

@@ -1,6 +1,6 @@
 # mhrv-rs — bypass censorship for free, with your own Google account
 
-[![Latest release](https://img.shields.io/github/v/release/therealaleph/MasterHttpRelayVPN-RUST?sort=semver&display_name=tag&logo=github&label=release)](https://github.com/therealaleph/MasterHttpRelayVPN-RUST/releases/latest)
+[![Latest release](https://img.shields.io/github/v/release/therealaleph/MasterHttpRelayVPN-RUST?display_name=tag&logo=github&label=release&color=blue)](https://github.com/therealaleph/MasterHttpRelayVPN-RUST/releases/latest)
 [![Downloads](https://img.shields.io/github/downloads/therealaleph/MasterHttpRelayVPN-RUST/total?label=downloads&logo=github)](https://github.com/therealaleph/MasterHttpRelayVPN-RUST/releases)
 [![CI](https://github.com/therealaleph/MasterHttpRelayVPN-RUST/actions/workflows/release.yml/badge.svg)](https://github.com/therealaleph/MasterHttpRelayVPN-RUST/actions/workflows/release.yml)
 [![License: MIT](https://img.shields.io/github/license/therealaleph/MasterHttpRelayVPN-RUST?color=blue)](LICENSE)