vendor: Fix Humanize for multi-byte runes

Fixes #4133

Gopkg.lock

@@ -147,7 +147,7 @@
   branch = "master"
   name = "github.com/markbates/inflect"
   packages = ["."]
-  revision = "ea17041f342f81e8849284b87bc3db1a6fc596bb"
+  revision = "54ffb37507cd7d2ccd4768855e84f9ff6c4352b6"
 
 [[projects]]
   name = "github.com/miekg/mmark"

tpl/inflect/inflect_test.go

@@ -19,6 +19,7 @@ func TestInflect(t *testing.T) {
 		expect interface{}
 	}{
 		{ns.Humanize, "MyCamel", "My camel"},
+		{ns.Humanize, "óbito", "Óbito"},
 		{ns.Humanize, "", ""},
 		{ns.Humanize, "103", "103rd"},
 		{ns.Humanize, "41", "41st"},