Fixes for second stage completion

See #82, release log:

• 7509828 by @IamMaxim: Updated README and added Hadoo...
• 3bc7ae5 by @IamMaxim: Fixed build.gradle.kts to crea...
• a478ecb by @IamMaxim: Merge remote-tracking branch '...
• ae9c13f by @fizruk: Bump version and add CHANGELOG...
• 83dec19 by @fizruk: Make the translator "work" for...
• 0e95418 by @IamMaxim: Updated manifest
• 9816675 by @IamMaxim: Updated j2ast to 0.1.0
• 27c8e04 by @fizruk: Print parsed (and mapped) tree...
• 7799162 by @fizruk: Support some primary expressio...
• 146928f by @fizruk: Add (very limited) support for...
• 5adae37 by @fizruk: Add mapping/placeholders for a...
• 515939d by @fizruk: Add placeholders for Statement...
• 247de69 by @fizruk: Add basic AST mapping for Comp...
• 9bc9d3e by @fizruk: Rename Main to Main2, because ...
• 7886262 by @IamMaxim: Added new ANTLR grammar
• 1bc8b1e by @someilay: polystat verification

Released by Rultor 1.70.6, see build log