v3.28.8

Bug Fixes

• helpers: hash guid to create group instead of relying on first char
  (eaf79a77)
• payment: prevent state issues caused by mutability
  (ea803054)

Refactor

• helpers: less convoluted way of reading first bit
  (5721c39a)

Pull requests merged

• Merge pull request #351 from blockchain/state-cleanup
  (1643b4ad)
• Merge pull request #350 from blockchain/hash-guid
  (c7cf2b48)