fixed ordering

README.md

@@ -5,8 +5,8 @@ This is a collection of IPython notebooks that I use to teach topics relating to
 
 - [Programming in Python](http://nbviewer.jupyter.org/github/phelps-sg/python-bigdata/blob/master/src/main/ipynb/intro-python.ipynb)
 - [Numerical Computing](http://nbviewer.jupyter.org/github/phelps-sg/python-bigdata/blob/master/src/main/ipynb/numerical-slides.ipynb)
-- [Analysing structured data using pandas](http://nbviewer.jupyter.org/github/phelps-sg/python-bigdata/blob/master/src/main/ipynb/pandas.ipynb)
 - [Relational data](http://nbviewer.jupyter.org/github/phelps-sg/python-bigdata/blob/master/src/main/ipynb/relational-python.ipynb)
+- [Analysing structured data using pandas](http://nbviewer.jupyter.org/github/phelps-sg/python-bigdata/blob/master/src/main/ipynb/pandas.ipynb)
 - [Map-Reduce programming and Apache Spark](http://nbviewer.jupyter.org/github/phelps-sg/python-bigdata/blob/master/src/main/ipynb/spark-mapreduce.ipynb)
 - [Column-oriented databases with HBase and HappyBase](http://nbviewer.jupyter.org/github/phelps-sg/python-bigdata/blob/master/src/main/ipynb/hbase-python-slides.ipynb)