Update README.md

Had a few problems installing this on Windows so made some very boring minor changes to include the Go version I seemed to require, together with the gubbins to install scipy / numpy.

README.md

@@ -33,13 +33,16 @@ Unresampled bands are apparently not aligned and start from the project's birth
 There is a [presentation](http://vmarkovtsev.github.io/techtalks-2017-moscow-lightning/) available.
 
 ### Installation
-You are going to need Go and Python 2 or 3.
+You are going to need Go (>= v1.8) and Python 2 or 3.
 ```
 go get gopkg.in/src-d/hercules.v2/cmd/hercules
 pip install -r requirements.txt
 wget https://github.com/src-d/hercules/raw/master/labours.py
 ```
 
+#### Windows
+Numpy and SciPy are requirements. Install the correct version by downloading the wheel from http://www.lfd.uci.edu/~gohlke/pythonlibs/#scipy.
+
 ### Usage
 ```
 # Use "memory" go-git backend and display the plot. This is the fastest but the repository data must fit into RAM.