Bump to v0.1.5

[Tinitto]

Added

• Added todos example application

Changed

• Replaced the second required argument of MongoStore.find(),
  MongoStore.update(), MongoStore.delete()with their first optional
  key-word argument query.
• Changed the limit parameter of the MongoStore.find() to be by default 0.
• Removed the Beanie-odm-specific arguments passed to MongoStore.insert(),
  MongoStore.find(), MongoStore.update(), MongoStore.delete().

Fixed

• Fixed error: "got Future attached to a different loop" when
  MongoStore.insert(), MongoStore.find(), MongoStore.update(), MongoStore.delete()
  are called especially during tests that create different event loops.
• Fixed SQLStore.delete() to return any nested items that were deleted.
• Fixed error: "got Future attached to a different loop" when
  RedisStore.insert(), RedisStore.find(), RedisStore.update(), RedisStore.delete()
  are called especially during tests that create different event loops.