Update 2.0.0-alpha-2 release notes with changes since alpha-1 (#150)

diff --git a/_posts/release/2019-01-31-accumulo-2.0.0-alpha-2.md b/_posts/release/2019-01-31-accumulo-2.0.0-alpha-2.md
index 517f61c..46e355f 100644
--- a/_posts/release/2019-01-31-accumulo-2.0.0-alpha-2.md
+++ b/_posts/release/2019-01-31-accumulo-2.0.0-alpha-2.md
@@ -16,7 +16,17 @@
 * Please see the [draft release notes for 2.0.0][draft_notes] for a list of the
   changes coming in 2.0.0, many of which are either complete, or nearly
   complete in this alpha release.
+  
+### Since 2.0.0-alpha-1
+
+ * New Map Reduce API {% ghi 743 %} {% ghi  751 %} {% ghi 753 %} {% ghi 803 %}
+ * Deprecated existing map reduce API [2465562] {% ghi 804 %}  {% ghi 892 %}
+ * Added ability to create scanners with default auths {% ghi 744 %}
+ * Updated AccumuloClient builder API {% ghi 792 %}
+ * AccumuloClient was made Closeable {% ghi 718 %}
+ * Scanners close server side sessions on close {% ghi 813 %} {% ghi 905 %}
 
 [javadoc]: {{ site.baseurl }}/docs/2.x/apidocs/
 [user_manual]: {{ site.baseurl }}/docs/2.x/
 [draft_notes]: {{ site.baseurl }}/release/accumulo-2.0.0
+[2465562]: https://github.com/apache/accumulo/commit/2465562cd088b126bfb17523c33c8acd0a48309f