Update README and ReleaseNotes for 4.6.2

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

README

@@ -1,7 +1,7 @@
-This is the README file for Subsurface 4.6.1
+This is the README file for Subsurface 4.6.2
 
 Please check the ReleaseNotes.txt for details about new features and
-changes since Subsurface 4.6 (and earlier versions).
+changes since Subsurface 4.6.1 (and earlier versions).
 
 Subsurface can be found at http://subsurface-divelog.org
 
@@ -26,11 +26,11 @@ If you want the latest release (instead of the bleeding edge
 development version) you can either get this via git or the release tar
 ball. After cloning run the following command:
 
-git checkout v4.6.1  (or whatever the last release is)
+git checkout v4.6.2  (or whatever the last release is)
 
 or download a tar ball from:
 
-http://subsurface-divelog.org/downloads/Subsurface-4.6.1.tgz
+http://subsurface-divelog.org/downloads/Subsurface-4.6.2.tgz
 
 Detailed build instructions can be found in the INSTALL file.
 

ReleaseNotes/ReleaseNotes.txt

@@ -1,8 +1,18 @@
 // _Subsurface_ 4.6 Release Notes
 
-_Subsurface_ next after 4.6 - January 2017
+_Subsurface_ 4.6.2 - February 2017
 ------------------------------------------
 
+Some of the changes since _Subsurface_ 4.6.1
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+- Planner: update altitude limits with unit change
+- Fix potential crash when merging dives
+- Handle dive dates before 1970 correctly
+- Include geo location when exporting to divelogs.de
+- Add credits button to about screen
+- Many updated translations
+
 Some of the changes since _Subsurface_ 4.6
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~