minor fix reference-currency -> base-currency

catalyst/examples/buy_low_sell_high_live.py

@@ -1,3 +1,14 @@
+'''
+This algorithm requires an additional library (ta-lib) beyond those required by catalyst.
+Install it first by running: 
+$ pip install TA-Lib
+
+If you get build errors like "fatal error: ta-lib/ta_libc.h: No such file or directory"
+it typically means that it can't find the underlying TA-Lib library and needs to be installed.
+See https://mrjbq7.github.io/ta-lib/install.html for instructions on how to install 
+the required dependencies.
+'''
+
 import talib
 from logbook import Logger