Publish roadmap.

TODO.md

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+Features that sooner or later will be added to `ngx_postgres`:
+
+* Make sure that we work-around `bytea` data corruption that takes place
+  when using 9.0+ database with older client library or vice-versa.
+
+* Add support for SSL connections to the database.
+
+* Add support for dropping of idle keep-alived connections to the
+  database.
+
+* Add support for sending mulitple queries in one go (transactions,
+  multiple SELECTs, etc), this will require changes in the processing
+  flow __and__ RDS format.
+
+* Add `postgres_escape_bytea` or `postgres_escape_binary`.
+
+* Use `PQescapeStringConn()` instead of `PQescapeString()`, this will
+  require lazy-evaluation of the variables after we acquire connection,
+  but before we send query to the database.  
+  Notes: Don't break `$postgres_query`.
+
+* Cancel long-running queries using `PQcancel()`.
+
+* Detect client library version using `PQlibVersion()` (PostgreSQL 9.1+)
+  or exports (for older releases):
+
+      8.0.0 -> PQcancel                  122
+      8.1.0 -> PQregisterThreadLock      125
+      8.1.4 -> PQescapeByteaConn         127
+      8.2.0 -> PQsendDescribePortal      136
+      8.3.0 -> PQconnectionNeedsPassword 140
+      8.4.0 -> PQinitOpenSSL             153
+      8.5.x -> PQinitOpenSSL             153
+      9.0.0 -> PQconnectStartParams      157
+      9.1.x -> PQlibVersion              160
+
+* Detect server version using `PQserverVersion()`.