Update version.

The rebar and hex.pm versions have diverged at some point in the
last two years, so i bumped to 0.2.5 to get them to the same
number.

src/esqlite.app.src

@@ -1,7 +1,7 @@
 {application, esqlite,
  [
   {description, "sqlite nif interface"},
-  {vsn, "0.2.3"},
+  {vsn, "0.2.5"},
   {modules, [esqlite3, esqlite3_nif]},
   {registered, []},
   {maintainers, ["Aleph Archives", "Qing Liang <qing.liang.cn@gmail.com>"]},