Fix typo

config.go

@@ -98,7 +98,7 @@ func (c *Config) parse() (*runtimeAssets, error) {
 	// Sources that fail the check are removed from the
 	// SourceSpecs array. We also check that sources have unique
 	// names.
-	tmp := make(map[string]struct{}{})
+	tmp := make(map[string]struct{})
 	var srcs []*SourceSpec
 	for _, spec := range c.SourceSpecs {
 		if err := spec.Check(handlerMap); err != nil {