Bump version 4.2.1

CHANGES

@@ -1,3 +1,7 @@
+In 4.2.1
+
+* Bug fix for `epgsql:connect(proplist())`
+
 In 4.2.0
 
 * Support for R16 was completely dropped. Maps are now used internally instead of proplists

src/epgsql.app.src

@@ -1,6 +1,6 @@
 {application, epgsql,
  [{description, "PostgreSQL Client"},
-  {vsn, "4.2.0"},
+  {vsn, "4.2.1"},
   {modules, []},
   {registered, []},
   {applications, [kernel,