Move subscriptions type hinting from bfxapi/websocket/types.py to bfxapi/websocket/subscriptions.py.

bfxapi/websocket/subscriptions.py

@@ -0,0 +1,28 @@
+from typing import TypedDict, Optional
+
+class Ticker(TypedDict):
+    chanId: int; symbol: str
+    pair: Optional[str]
+    currency: Optional[str]
+
+class Trades(TypedDict):
+    chanId: int; symbol: str
+    pair: Optional[str]
+    currency: Optional[str]
+
+class Book(TypedDict):
+    chanId: int
+    symbol: str
+    prec: str
+    freq: str
+    len: str
+    subId: int
+    pair: str
+
+class Candles(TypedDict):
+    chanId: int
+    key: str
+
+class Status(TypedDict):
+    chanId: int
+    key: str