Merge pull request #54 from egorse/master

The value expand fallback to actual ENV values

godotenv.go

@@ -296,6 +296,9 @@ func parseValue(value string, envMap map[string]string) string {
 		if val, ok := envMap[key]; ok {
 			return val
 		}
+		if val, ok := os.LookupEnv(key); ok {
+			return val
+		}
 		return ""
 	})
 	return value