Update doi and citation

Author: prisae

README.rst

@@ -4,7 +4,7 @@ Getting started with controlled-source electromagnetic 1D modeling
 **The Leading Edge - Geophysical Tutorial (TLE April 2017)**
 
 Werthmüller, D., 2017, Getting started with controlled-source electromagnetic
-1d modeling: The Leading Edge, 36, 352-355;
+1D modeling: The Leading Edge, 36, 352-355;
 doi: `10.1190/tle36040352.1 <http://dx.doi.org/10.1190/tle36040352.1>`_.
 
    - `Manuscript <./Manuscript.ipynb>`_