⚡️ Made last semicolon optional in Struct and Message field declarations

// This now works:
struct You { likeJazz: Bool }

// And that works too:
message GuessCoin {
    probably: Int as coins;
    nothing: Int as coins
    // no trailing semicolon above!
}

🧑‍🍳 Contributor: anton-trunov
🐙 Implementation: #395
🍽 To be released in: v1.4.0

🍲 The more you shave away, the clearer things become
♨️ @tact_kitchen