add release notes for v4.5.1

RELEASE-NOTES-4.5.1

@@ -0,0 +1,24 @@
+
+ ┌──────────────────────────────┐
+ │ Release notes for i3 v4.5.1  │
+ └──────────────────────────────┘
+
+This is the i3 v4.5.1, a bugfix release. This version is considered stable. All
+users of i3 are strongly encouraged to upgrade.
+
+This release fixes an i3 lockup when dragging floating windows from one monitor
+  to another.
+
+Furthermore, in the release process for v4.5, there was a human error leading
+  to i3 thinking that v4.5 is a debug version, therefore allocating 25 MB of
+  shared memory logging ringbuffer by default.
+
+ ┌────────────────────────────┐
+ │ Changes in v4.5.1          │
+ └────────────────────────────┘
+
+  • Bugfix: Don’t warp the pointer when dragging floating windows
+  • i3-dmenu-desktop: improve error message when dmenu cannot be found
+  • Add YAJL_CFLAGS to i3-msg.mk
+
+-- Michael Stapelberg, 2013-03-18

man/asciidoc.conf

@@ -7,7 +7,7 @@ template::[header-declarations]
 <refentrytitle>{mantitle}</refentrytitle>
 <manvolnum>{manvolnum}</manvolnum>
 <refmiscinfo class="source">i3</refmiscinfo>
-<refmiscinfo class="version">4.5</refmiscinfo>
+<refmiscinfo class="version">4.5.1</refmiscinfo>
 <refmiscinfo class="manual">i3 Manual</refmiscinfo>
 </refmeta>
 <refnamediv>