Replace README.org

README.org

@@ -45,7 +45,7 @@ So far, notebooks are listed by difficulty, indicated by stars (☆ = simple,
      statistics and visualisation (☆☆)
 - [[file:Dracor.ipynb][DraCor]] :: retrieving data from a REST API, text transformation and
      classification (☆☆)
--  [[file:machine_learning.ipynb][Machine Learning]] :: recipes for common machine learning tasks (☆☆)
+- [[file:machine_learning.ipynb][Machine Learning]] :: recipes for common machine learning tasks (☆☆)
 - [[file:Mondrian.ipynb][Mondrian]] :: turtle graphics, recursion, art (☆☆)
 - [[file:statistics_top50faculty.ipynb][Statistics top 50 faculty]] :: exploratory statistical analysis of the
      [[http://cs.brown.edu/people/apapouts/faculty_dataset.html][dataset of 2200 faculty in 50 top US computer science graduate