Update dependencies

- uses newer version of go-ethereum required for go1.11

vendor/github.com/spf13/cobra/cobra.go

@@ -70,7 +70,8 @@ func AddTemplateFuncs(tmplFuncs template.FuncMap) {
 	}
 }
 
-// OnInitialize takes a series of func() arguments and appends them to a slice of func().
+// OnInitialize sets the passed functions to be run when each command's
+// Execute method is called.
 func OnInitialize(y ...func()) {
 	initializers = append(initializers, y...)
 }
@@ -188,3 +189,12 @@ func ld(s, t string, ignoreCase bool) int {
 	}
 	return d[len(s)][len(t)]
 }
+
+func stringInSlice(a string, list []string) bool {
+	for _, b := range list {
+		if b == a {
+			return true
+		}
+	}
+	return false
+}