fpta: bump version to v0.3.11

Backward compatibility break:
-----------------------------

The database format signature has been changed to prevent
forward-interoperability with an previous releases, which may lead to a
[false positive diagnosis of database corruption](erthink/libmdbx#238)
due to flaws of an old library versions.

This change is mostly invisible:

 - previously versions are unable to read/write a new DBs;
 - but the new release is able to handle an old DBs and will silently upgrade ones.

Signed-off-by: Leonid Yuriev <leo@yuriev.ru>

appveyor.yml

@@ -1,4 +1,4 @@
-version: 0.3.10.{build}
+version: 0.3.11.{build}
 
 environment:
   GTEST_SHUFFLE: 1