Added a changelog

Author: alexcesaro

CHANGELOG.md

@@ -0,0 +1,64 @@
+# Change Log
+All notable changes to this project will be documented in this file.
+This project adheres to [Semantic Versioning](http://semver.org/).
+
+## [2.0.0] - 2016-03-20
+
+- `New` signature changed. The default address used is now ":8125". To use
+  another address use the `Address` option:
+
+  Before:
+  ```
+  statsd.New(":8125")
+  statsd.New(":9000")
+  ```
+
+  After
+  ```
+  statsd.New()
+  statsd.New(statsd.Address(":9000"))
+  ```
+
+- The `rate` parameter has been removed from the `Count` and `Timing` methods.
+  Use the new `SampleRate` option instead.
+
+- `Count`, `Gauge` and `Timing` now accept a `interface{}` instead of an int as
+  the value parameter. So you can now use any type of integer or float in these
+  functions.
+
+- The `WithInfluxDBTags` and `WithDatadogTags` options were replaced by the
+  `TagsFormat` and `Tags` options:
+
+  Before:
+  ```
+  statsd.New(statsd.WithInfluxDBTags("tag", "value"))
+  statsd.New(statsd.WithDatadogTags("tag", "value"))
+  ```
+
+  After
+  ```
+  statsd.New(statsd.TagsFormat(statsd.InfluxDB), statsd.Tags("tag", "value"))
+  statsd.New(statsd.TagsFormat(statsd.Datadog), statsd.Tags("tag", "value"))
+  ```
+
+- All options whose named began by `With` had the `With` stripped:
+
+  Before:
+  ```
+  statsd.New(statsd.WithMaxPacketSize(65000))
+  ```
+
+  After
+  ```
+  statsd.New(statsd.MaxPacketSize(65000))
+  ```
+
+- `ChangeGauge` has been removed as it is a bad practice: UDP packets can be
+  lost so using relative changes can cause unreliable values in the long term.
+  Use `Gauge` instead which sends an absolute value.
+
+- The `Histogram` method has been added.
+
+- The `Clone` method was added to the `Client`, it allows to create a new
+  `Client` with different rate / prefix / tags parameters while still using the
+  same connection.