Update README

Author: huacnlee

README.md

@@ -40,12 +40,10 @@ Load macro and init translations in `lib.rs` or `main.rs`:
 extern crate rust_i18n;
 
 // Init translations for current crate.
+// This will load Configuration using the `[package.metadata.i18n]` section in `Cargo.toml` if exists.
+// Or you can pass arguments by `i18n!` to override it.
 i18n!("locales");
 
-// Or just use `i18n!`, default locales path is: "locales" in current crate.
-//
-i18n!();
-
 // Config fallback missing translations to "en" locale.
 // Use `fallback` option to set fallback locale.
 //
@@ -71,8 +69,7 @@ i18n!("locales",
 // Now, if the message length exceeds 64, the `t!` macro will automatically generate
 // a 12-byte short hashed key with a "t_" prefix for it, if not, it will use the original.
 
-// Configuration using the `[package.metadata.i18n]` section in `Cargo.toml`,
-// Useful for the `cargo i18n` command line tool.
+// If no any argument, use config from Cargo.toml or default.
 i18n!();
 ```