Update draft release notes to 1.8.2

Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/RelNotes/1.8.2.txt

@@ -115,6 +115,9 @@ UI, Workflows & Features
    rewrite the names and email addresses of people using the mailmap
    mechanism.
 
+ * "git log --cc --graph" now shows the combined diff output with the
+   ancestry graph.
+
  * "git mergetool" and "git difftool" learned to list the available
    tool backends in a more consistent manner.
 
@@ -144,6 +147,9 @@ UI, Workflows & Features
    you do not have any commits in your history, but it now gives you
    an empty index (to match non-existent commit you are not even on).
 
+ * "git status" says what branch is being bisected or rebased when
+   able, not just "bisecting" or "rebasing".
+
  * "git submodule" started learning a new mode to integrate with the
    tip of the remote branch (as opposed to integrating with the commit
    recorded in the superproject's gitlink).
@@ -295,6 +301,9 @@ details).
    failed to remove the real location of the $GIT_DIR it created.
    This was most visible when interrupting a submodule update.
 
+ * "git cvsimport" mishandled timestamps at DST boundary.
+   (merge 48c9162 bw/get-tz-offset-perl later to maint).
+
  * We used to have an arbitrary 32 limit for combined diff input,
    resulting in incorrect number of leading colons shown when showing
    the "--raw --cc" output.