change panadas version

Shlomi Kushchi · web-flow · commit 03f0f7eb52bb · 2020-07-07T15:06:27.000+03:00
zipline uses pandas==0.18.1
diff --git a/requirements/requirements.txt b/requirements/requirements.txt
@@ -1,4 +1,4 @@
-pandas>0.22
+pandas>=0.18.1
 requests>=2.24.0,<3
 urllib3>=1.24.3,<1.26
 websocket-client>=0.56.0,<1
