Enable percentile output format (#38)

* [wip] Wip on enabling output textual percentile distribution

* [add] Added example for printing of the percentile output format

* [add] printing +Inf within Inverted Percentile in the same format as the Java implementation

example_hdr_test.go

@@ -0,0 +1,35 @@
+package hdrhistogram_test
+
+import (
+	"github.com/HdrHistogram/hdrhistogram-go"
+	"os"
+)
+
+// The following example details the creation of an histogram used to track
+// and analyze the counts of observed integer values between 0 us and 30000000 us ( 30 secs )
+// and the printing of the percentile output format
+func ExampleHistogram_PercentilesPrint() {
+	lH := hdrhistogram.New(1, 30000000, 3)
+	input := []int64{
+		459876, 669187, 711612, 816326, 931423, 1033197, 1131895, 2477317,
+		3964974, 12718782,
+	}
+
+	for _, sample := range input {
+		lH.RecordValue(sample)
+	}
+
+	lH.PercentilesPrint(os.Stdout, 1, 1.0)
+	// Output:
+	//  Value	Percentile	TotalCount	1/(1-Percentile)
+	//
+	//   460031.000     0.000000            1         1.00
+	//   931839.000     0.500000            5         2.00
+	//  2478079.000     0.750000            8         4.00
+	//  3966975.000     0.875000            9         8.00
+	// 12722175.000     0.937500           10        16.00
+	// 12722175.000     1.000000           10          inf
+	// #[Mean    =  2491481.600, StdDeviation   =  3557920.109]
+	// #[Max     = 12722175.000, Total count    =           10]
+	// #[Buckets =           15, SubBuckets     =         2048]
+}

go.mod

@@ -3,6 +3,7 @@ module github.com/HdrHistogram/hdrhistogram-go
 go 1.14
 
 require (
+	github.com/golangci/golangci-lint v1.31.0 // indirect
 	github.com/google/go-cmp v0.5.2
 	github.com/stretchr/testify v1.6.1
 )