Replace bintree.RBTree (deprecated by its author) with faster sortedcontainers.SortedDict (recommended by bintree authors) in order book object.

brianboonstra · brianboonstra · commit 68f0e9018ab8 · 2018-03-11T14:15:08.000-05:00
diff --git a/requirements.txt b/requirements.txt
@@ -1,4 +1,4 @@
-bintrees==2.0.7
+sortedcontainers>=1.5.9
 requests==2.13.0
 six==1.10.0
 websocket-client==0.40.0
