Add python dependencies

README.md

@@ -38,7 +38,7 @@ There is a [presentation](http://vmarkovtsev.github.io/techtalks-2017-moscow-lig
 You are going to need Go and Python 2 or 3.
 ```
 go get gopkg.in/src-d/hercules.v1/cmd/hercules
-pip install pandas seaborn
+pip install -r requirements.txt
 wget https://github.com/src-d/hercules/raw/master/labours.py
 ```
 
@@ -185,5 +185,10 @@ in-memory storage may require much RAM, for example, the Linux kernel takes over
 for the Linux kernel in "couples" mode is 1.5 GB and takes more than an hour / 180GB RAM to be
 parsed. However, most of the repositories are parsed within a minute.
 
+2. to use matplotlib in macOS and avoid errors us
+   ```
+   echo "backend: TkAgg" > ~/.matplotlib/matplotlibrc
+   ```
+
 ### License
 MIT.

requirements.txt

@@ -0,0 +1,13 @@
+args==0.1.0
+clint==0.5.1
+cycler==0.10.0
+matplotlib==2.0.2
+numpy==1.13.1
+pandas==0.20.3
+pyparsing==2.2.0
+python-dateutil==2.6.1
+pytz==2017.2
+PyYAML==3.12
+scipy==0.19.1
+seaborn==0.8
+six==1.10.0