adding requirements for docs

requirements-docs.txt

@@ -0,0 +1,23 @@
+ccxt==1.18.74
+SQLAlchemy==1.2.15
+python-telegram-bot==11.1.0
+arrow==0.12.1
+cachetools==3.0.0
+requests==2.21.0
+urllib3==1.24.1
+wrapt==1.10.11
+pandas==0.23.4
+scikit-learn==0.20.2
+joblib==0.13.0
+scipy==1.2.0
+jsonschema==2.6.0
+numpy==1.15.4
+TA-Lib==0.4.17
+tabulate==0.8.2
+coinmarketcap==5.0.3
+
+# Required for hyperopt
+scikit-optimize==0.5.2
+
+#Load ticker files 30% faster
+python-rapidjson==0.6.3