Spectre v1.3.3 Wallet

I'm happy to announce the release of v1.3.3 of the Spectre wallet. This is a minor update resolving an issue with the UI updating that some Windows 64-bit users experienced, and improving the reliability of ring signature generation if small ring sizes are selected. There are also startup and sync performance improvements in this release, so all users are encouraged to upgrade.

Windows 64-bit, Windows 32-bit and macOS wallet binaries can be found here: https://github.com/spectrecoin/spectre/releases/tag/v1.3.3

Instructions for building from source on Linux have also been added to the README.

The next release will be v1.4, a major release incorporating a modernised fully-native wallet as part of our first step towards mobile wallets, as well as many improvements to the anonymous (stealth) transactions. The v1.4 release will also include binaries for Linux platforms.