Merge pull request #138 from timblair/clearer_sampling_info

Make it clearer that sampling is only for counters.

README.md

@@ -33,6 +33,11 @@ Counting
 This is a simple counter. Add 1 to the "gorets" bucket. It stays in memory
 until the flush interval `config.flushInterval`.
 
+### Sampling
+
+    gorets:1|c|@0.1
+
+Tells StatsD that this counter is being sent sampled every 1/10th of the time.
 
 Timing
 ------
@@ -51,13 +56,6 @@ generate the following list of stats for each threshold:
 Where `$KEY` is the key you stats key you specify when sending to statsd, and
 `$PCT` is the percentile threshold.
 
-Sampling
---------
-
-    gorets:1|c|@0.1
-
-Tells StatsD that this counter is being sent sampled every 1/10th of the time.
-
 Gauges
 ------
 StatsD now also supports gauges, arbitrary values, which can be recorded.