Robo 3T 1.4 with MongoDB 4.2 Support

See the blog post for details: http://blog.robomongo.org/robo-3t-1-4
Supported Platforms: https://github.com/Studio3T/robomongo#supported-platforms

New Features:

• Mongo shell 4.2 upgrade
• Support for Ubuntu 20.04 and macOS 10.15 (Catalina)
• SSH: ECDSA and Ed25519 keys support on Windows & macOS (#1719, #1530, #1590)
• Manually specify visible databases (#1696, #1368, #389)

Improvements:

• Qt upgrade (v5.12.8 - Apr/2020, Windows & macOS only)
• OpenSSL upgrade (v1.1.1f - Mar/2020, Windows & macOS only)
• libssh2 upgrade (v1.9.0 - Jun/2019, Windows & macOS only)

Fixes:

• Authentication database option isn't used properly (#1696)
• Add/Edit index ops fixed (re-written) (#1692)
• Crash when expanding admin users (#1728)
• Unable to run query after shell timeout reached (#1529)