Update notes for version 0.4.9

Version 0.4.9 is a minor release. Mostly some fixes and a small number of new events.

Fixing the levels bookcases took a bit longer than I expected, hopefully it's fixed for good!

0.4.10 will continue to focus on adding more events to the game. There are 25 now and I hope to add about a dozen more.

• 2 new events added
  
• Various minor event/script fixes
  
• Fix issue where bookcases could be placed over wall switches
  
• Fix custom key mapping getting lost on reload