Added release of version 1.2.0 to news items

Author: jlstevens

doc/latest_news.html

@@ -5,7 +5,7 @@
       </br>
       Mar 19th 2015: HoloViews now available on <a href="https://cloud.sagemath.com">SageMathCloud</a>.
       </br>
-      Apr 15th 2015: HoloViews 1.1.0 released and now available on <a href="https://pypi.python.org/pypi/holoviews/1.1.0">PyPI</a>.
-      </br>
       May 14th 2015: Talk on HoloViews announced at <a href="http://scipy2015.scipy.org/ehome/115969/292868/">SciPy Conference 2015</a>.
+      </br>
+      May 27th 2015: HoloViews 1.2.0 released and now available on <a href="https://pypi.python.org/pypi/holoviews/1.2.0">PyPI</a>.
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