Add benchmark results in README.

README

@@ -78,4 +78,14 @@ Conn#UpdateHook
 
 Function:
 Conn#CreateScalarFunction
-Conn#CreateAggregateFunction
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+Conn#CreateAggregateFunction
+
+$ go test -test.bench '.*'
+BenchmarkValuesScan	  500000	      4658 ns/op
+BenchmarkScan	  	  500000	      4324 ns/op
+BenchmarkNamedScan	  200000	      9221 ns/op
+BenchmarkInsert	      500000	      6088 ns/op
+BenchmarkNamedInsert  500000	      6726 ns/op
+BenchmarkLike	     1000000	      2508 ns/op
+BenchmarkHalf	      500000	      4811 ns/op
+BenchmarkRegexp	      500000	      6170 ns/op
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