fix Opentrons integration (#689)

Author: rickwierenga

README.md

@@ -47,9 +47,9 @@ await lh.return_tips()
 To run the same protocol on an **Opentrons**, use the following:
 
 ```python
-from pylabrobot.liquid_handling.backends import OpentronsBackend
+from pylabrobot.liquid_handling.backends import OpentronsOT2Backend
 deck = Deck.load_from_json_file("opentrons-layout.json")
-lh = LiquidHandler(backend=OpentronsBackend(host="x.x.x.x"), deck=deck)
+lh = LiquidHandler(backend=OpentronsOT2Backend(host="x.x.x.x"), deck=deck)
 ```
 
 Or **Tecan** (also works on any operating system!):

docs/api/pylabrobot.liquid_handling.backends.rst

@@ -27,7 +27,7 @@ Hardware
     backends.hamilton.base.HamiltonLiquidHandler
     backends.hamilton.STAR_backend.STAR
     backends.hamilton.vantage_backend.Vantage
-    backends.opentrons_backend.OpentronsBackend
+    backends.opentrons_backend.OpentronsOT2Backend
     backends.tecan.EVO_backend.EVOBackend
 
 Net

pylabrobot/liquid_handling/backends/__init__.py

@@ -4,7 +4,7 @@
 from .hamilton.STAR_backend import STAR, STARBackend
 from .hamilton.vantage_backend import Vantage, VantageBackend
 from .http import HTTPBackend
-from .opentrons_backend import OpentronsBackend
+from .opentrons_backend import OpentronsOT2Backend
 from .saver_backend import SaverBackend
 from .serializing_backend import (
   SerializingBackend,