Release v1.3.0

Added

• Real-time status monitoring for each site. Jump can now ping your sites and report on their
  availability (e.g. online, offline, error).

Fixed

• Close session early to avoid session lock blocking API calls.
• Updated composer packages, addresses several security alerts for older version of Guzzle.
• Updated NPM packages, addresses vulnerabilities in Terser and EJS.
• Fix incorrect reference to CSS file in error page.
• Various minor code improvements.