Adding conference dates

Signed-off-by: LibApps <LibApps>

diff --cc evergreen-history.txt
index 2efb7e7,8885cd2..42ee595
--- 1/evergreen-history.txt
--- 2/evergreen-history.txt
+++ b/evergreen-history.txt
@@@ -129,4 -130,4 +130,5 @@@
  2015-03-03 Evergreen 2.7.4 released (security release)
  2015-03-04 Evergreen 2.8-beta released
  2015-03-31 Evergreen 2.8.0 released
- 2016-04-20/2016-04-23 Eighth Evergreen Conference held in Raleigh, NC
 -2015-11-04/2015-11-06 Evergreen Hack-a-way Danvers,MA 
++2015-11-04/2015-11-06 Evergreen Hack-a-way Danvers,MA
++2016-04-20/2016-04-23 Eighth Evergreen conference held in Raleigh, NC