Set viper to PR #635, SetKeysCaseSensitive

spf13/viper#635

YAML keys are case sensitive according to the specification, Viper has historically forced lowercase to make lookups more predictable. This becomes a problem when the YAML is then exported again and the consumer is case sensitive.
The Viper PR to which this sets the module to seems to resolve this.

go.mod

@@ -0,0 +1,12 @@
+module github.com/cirrocloud/yamlpack
+
+go 1.12
+
+require (
+	github.com/BurntSushi/toml v0.3.1 // indirect
+	github.com/charter-se/structured v0.0.0-20190211172727-b8be75e216c8
+	github.com/jjeffery/errors v1.0.3 // indirect
+	github.com/jjeffery/kv v0.7.0 // indirect
+	github.com/spf13/viper v1.3.2-0.20190315063904-3954e415200e
+	gopkg.in/yaml.v2 v2.2.2
+)

go.sum

@@ -0,0 +1,49 @@
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+github.com/charter-se/structured v0.0.0-20190211172727-b8be75e216c8 h1:pd3En4tnJcb25vv+FrPM04gxuLuOkvXan4oL15pDEjg=
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yamlpack.go

@@ -30,6 +30,9 @@ type Viper viper.Viper
 
 //New returns a newly created and initialized *Yp
 func New() *Yp {
+	//Set Case sensiity true
+	// this is a global in viper, nothing to be done about it
+	viper.SetKeysCaseSensitive(true)
 	yp := &Yp{}
 	yp.Handlers = make(map[string]func(string) error)
 	yp.Files = make(map[string][]*YamlSection)