v0.4.1

* No code changes to v0.4.0 for the exporter.
* First release switching to tar-file based distribution.
* First release with Windows and Darwin cross-builds.\\

v0.4.0

* Fix panic due to inconsistent label cardinality when using queries.yaml with
  queries which return extra columns.
* Add metric for whether the user queries YAML file parsed correctly. This also
  includes the filename and SHA256 sum allowing tracking of updates.
* Add pg_up metric to indicate whether the exporter was able to connect and
  Ping() the PG instance before a scrape.
* Fix broken link in landing page for `/metrics`

v0.3.0

* Add support for PostgreSQL 10.

v0.2.3

* Add support for the 16kB unit when decoding pg_settings. (prometheus-community#101)

v0.2.2

* Fix DSN logging. The exporter previously never actually logged the DSN when
  database connections failed. This was also masking a logic error which could
  potentially lead to a crash when DSN was unparseable, though no actual
  crash could be produced in testing.

v0.2.1

* Ignore functions that cannot be executed during replication recovery (prometheus-community#52)
* Add a `-version` flag finally.
* Add confirmed_flush_lsn to pg_stat_replication.

v0.2.0

 * Major change - use pg_settings to retrieve runtime variables. Adds >180
   new metrics and descriptions (big thanks to Matt Bostock for this work).

   Removes the following metrics:
   ```
   pg_runtime_variable_max_connections
   pg_runtime_variable_max_files_per_process
   pg_runtime_variable_max_function_args
   pg_runtime_variable_max_identifier_length
   pg_runtime_variable_max_index_keys
   pg_runtime_variable_max_locks_per_transaction
   pg_runtime_variable_max_pred_locks_per_transaction
   pg_runtime_variable_max_prepared_transactions
   pg_runtime_variable_max_standby_archive_delay_milliseconds
   pg_runtime_variable_max_standby_streaming_delay_milliseconds
   pg_runtime_variable_max_wal_senders
   ```

   They are replaced by equivalent names under `pg_settings` with the exception of
   ```
   pg_runtime_variable_max_standby_archive_delay_milliseconds
   pg_runtime_variable_max_standby_streaming_delay_milliseconds
   ```
   which are replaced with
   ```
   pg_settings_max_standby_archive_delay_seconds
   pg_settings_max_standby_streaming_delay_seconds
   ```

v0.1.3

* Update the Go build to 1.7.5 to include a fix for NAT handling.
* Fix passwords leaking in DB url error message on connection failure.

v0.1.2

* Use a connection pool of size 1 to reduce memory churn on target database.

v0.1.1

* Fix pg_stat_replication metrics not being collected due to semantic version
  filter problem.