Update DOI and Zenodo links for v1.6

ANNOUNCE

@@ -28,7 +28,7 @@ If you need help, find a bug, want new features or have any questions, please se
 If your published work uses cclib, please support its development by citing the following article:
     N. M. O'Boyle, A. L. Tenderholt, K. M. Langner, cclib: a library for package-independent computational chemistry algorithms, J. Comp. Chem. 29 (5), 839-845 (2008)
 You can also specifically reference this version of cclib as:
-    Eric Berquist, Karol M. Langner, Noel M. O'Boyle, and Adam L. Tenderholt. Release of cclib version 1.5. 2016. https://dx.doi.org/10.5281/zenodo.60670
+    Eric Berquist, Karol M. Langner, Noel M. O'Boyle, and Adam L. Tenderholt. Release of cclib version 1.6. 2018. https://dx.doi.org/10.5281/zenodo.1407790
 
 Regards,
 The cclib development team

README.md

@@ -1,6 +1,6 @@
 ### cclib
 
-[![DOI](https://zenodo.org/badge/doi/10.5281/zenodo.50324.svg)](https://dx.doi.org/10.5281/zenodo.60670)
+[![DOI](https://zenodo.org/badge/doi/10.5281/zenodo.1407790.svg)](https://dx.doi.org/10.5281/zenodo.1407790)
 [![PyPI version](http://img.shields.io/pypi/v/cclib.svg?style=flat)](https://pypi.python.org/pypi/cclib)
 [![GitHub release](https://img.shields.io/github/release/cclib/cclib.svg?style=flat)](https://github.com/cclib/cclib/releases)
 [![build status](http://img.shields.io/travis/cclib/cclib/master.svg?style=flat)](https://travis-ci.org/cclib/cclib)

doc/sphinx/index.rst

@@ -89,4 +89,4 @@ A record for the latest release is also available on Zenodo_.
 .. _QMForge: https://qmforge.net/
 .. _literature: http://pubs.acs.org/doi/abs/10.1021/jacs.5b05600
 .. _DOI: http://dx.doi.org/10.1002/jcc.20823
-.. _Zenodo: http://dx.doi.org/10.5281/zenodo.44552
+.. _Zenodo: http://dx.doi.org/10.5281/zenodo.1407790