Update roadmap

Dependencies

• [2] PGNTR2EP Improved README and ider roadmap
• [3] QXUEMZ3B Initial CahngeProvider
• [4] G54TB4QZ typo fix
• [5] 37OJKSWJ Improved caching code a lot
• [6] NTRPUMVQ Improved README and added roadmap.
• [*] GGYFPXND Initial plugin

Change contents

• replacement in README.md at line 23
  [2.59536]→[2.59536:59553](∅→∅)
  − ## April (0.2.x)
  [2.59536]

  [2.59553]
  + ## May (0.2.x)