Update Discord URL

Increment version to 0.3.3 (#479)

Increment version to 0.3.2 (#472)

Increment version to 0.3.1 (#460)

Update readme screenshots (#451)

Increment version to 0.2.2 (#369)

Increment version to 0.2.1 (#363)

Increment version to 0.2.0 (#349)

Increment version to 0.1.1 (#296)

Increment version to 0.1.0 (#289)