Demo patch notes 0.3.2

Just a small update with a few improvements and bug fixes

• Improved storage minecart AI
  
• Added support to increase selection by holding down shift
  
• Made selection of grinders and rails more precise
  

• Fixed some cases where miners would stand still and just wait even though there were gems left to mine
  
• Fixed a bug causing the first miner to walk far away instead of starting mining after resetting the game