v1.6.0-rc4

statements-manager v1.6.0-rc4 continues the ongoing work to generate more useful statement files for holding contests (e.g. JAG domestic contest, regional contest, and more)

• FIX: write #pragma once in constraints file #87
• ADD (feature): generating problemset file (beta) #89
  • assets are not supported (we want to support them at next release)