v0.3.0

I hope this is the last untested release and later releases will be professionally tested by my friend.

New features:

• Higscores table
• Use JSON instead of YAML for all configuration files
• Game pause mechanism
• Game over screen with "Game Over" text
• WIndows CI/CD builds with Appveyor
• Configurable key bindings

... and various small fixes.

New features! Windows build v0.2

Features introduced from previous release:

• Wall kick. Implemented order: left wall, right wall, floor
• Hard drop
• Phantom shape
• Three next shapes

Based on 7d6b30b.

First ever windows build

Here I am publishing Windows binaries with all dependencies included. 641197e commit was taken to build. It is hard for me to maintain Windows builds because I have no own Windows machine. Hope I will make binary releases with every cool feature or serious bug fixing.