Updated __init__.py to python 3 import style

this format works in __init__.py file: "from package-name.module-name import class"

snipeit/__init__.py

@@ -1,9 +1,9 @@
-from Assets import Assets
-from Company import Company
-from Locations import Locations
-from Accessories import Accessories
-from Consumables import Consumables
-from Components import Components
-from Users import Users
-from StatusLabels import StatusLabels
-from Models import Models
+from snipeit.Assets import Assets
+from snipeit.Company import Company
+from snipeit.Locations import Locations
+from snipeit.Accessories import Accessories
+from snipeit.Consumables import Consumables
+from snipeit.Components import Components
+from snipeit.Users import Users
+from snipeit.StatusLabels import StatusLabels
+from snipeit.Models import Models