Update README and configure.ac for 2.5.2 release

Signed-off-by: Paul Mackerras <[email protected]>

Author: paulusmack

README

@@ -67,9 +67,25 @@ use any IP address.  (This only applies where the peer is
 authenticating itself to you, of course.)
 
 
-What's new in ppp-2.5.1
+What's new in ppp-2.5.2
 ***********************
 
+* Some old and probably unused code has been removed, notably the
+  pppgetpass program and the passprompt plugin, and some of the files
+  in the sample and scripts directories.
+
+* If a remote number has been set, it is available to scripts in the
+  REMOTENUMBER environment variable.
+
+* The Solaris port has been updated, including updated installation
+  instructions in README.sol2.
+
+* Various other bug fixes and minor enhancements.
+
+
+What was new in ppp-2.5.1
+*************************
+
 * The files copied to /etc/ppp (or <sysconfdir>/ppp) now have
   ".example" appended to their filenames, so as to indicate that they
   are just examples, and to avoid overwriting existing configuration

configure.ac

@@ -1,6 +1,6 @@
 AC_PREREQ([2.69])
 AC_INIT([ppp],
-        [2.5.2-dev],
+        [2.5.2],
         [https://github.com/ppp-project/ppp])
 
 m4_ifdef([AM_SILENT_RULES],[AM_SILENT_RULES([yes])])