Use current version of libomemo.

This should help with #29.

README.md

-# lurch 0.6.1
+# lurch 0.6.2
 /lʊʁç/. In German, an Axolotl is a type of Lurch, which simply means 'amphibian'. This plugin brings Axolotl, by now renamed to double ratchet, to libpurple applications such as [Pidgin](https://www.pidgin.im/) by implementing [OMEMO](https://conversations.im/omemo/).
 
 (Plus I thought the word sounds funny, especially when pronounced by a speaker of English.)
@@ -16,7 +16,7 @@
 ### Windows
 Thanks to EionRobb, Windows users can use the dlls he compiled and provides here: https://eion.robbmob.com/lurch/
 1. Download the plugin .dll itself and put it in the `Program Files\Pidgin\plugins` directory. If you want to talk to other OMEMO clients, use _lurch-compat.dll_.
-2. Download _libgcrypt-20.dll_ and _libgpg-error-0.dll_ and put them in `Program Files\Pidgin` directory.
+2. Download _libgcrypt-20.dll_ and _libgpg-error-0.dll_ and put them in the `Program Files\Pidgin` directory.
 
 These instructions can also be found at the provided link.
 

libomemo @ d3c16056

-Subproject commit 5e48eeb0c95a1bdad6b5a3436b4ee2e019ea12e9
+Subproject commit d3c16056c4f29de19ba682b6e95e6e5e87de67e1

src/lurch.c

@@ -2712,7 +2712,7 @@ static PurplePluginInfo info = {
 
     "core-riba-lurch",
     "lurch",
-    "0.6.1",
+    "0.6.2",
 
     "Implements OMEMO for libpurple.",
     "End-to-end encryption using the Signal protocol, adapted for XMPP.",