typo fixes

Author: Shlomi Kushchi

README.md

@@ -200,9 +200,9 @@ is raised. This module itself does not provide any threading
 capability, so if you need to consume the messages pushed from the
 server, you need to run it in a background thread.
 
-We provide 2 price data websockets. the polygon data, and the alpaca data.
-we default to Alpaca data, and one must explicitly specify the polygon data stream in order to use that.
-it is done by passing the `data_stream` keyword to the `__init__()` function of `StreamConn` (options: `'alpacadatav1', 'polygon'`)
+We provide 2 price data websockets. The polygon data, and the alpaca data.
+We default to Alpaca data, and one must explicitly specify the polygon data stream in order to use that.
+It is done by passing the `data_stream` keyword to the `__init__()` function of `StreamConn` (options: `'alpacadatav1', 'polygon'`)
 
 This class provides a unique interface to the two interfaces, both
 Alpaca's account/trade updates events and Polygon's price updates.