chore: Updated readme file [ci skip]

Signed-off-by: Xingwang Liao <kuoruan@gmail.com>

Author: kuoruan

README.md

@@ -2,7 +2,7 @@
 
 # Chromium Android
 
-[![Build Status](https://travis-ci.org/kuoruan/Chromium-Android.svg?branch=master)](https://travis-ci.org/kuoruan/Chromium-Android) [![Release Version](https://img.shields.io/github/release/kuoruan/Chromium-Android.svg)](https://github.com/kuoruan/Chromium-Android/releases/latest) [![Latest Release Download](https://img.shields.io/github/downloads/kuoruan/Chromium-Android/latest/total.svg)](https://github.com/kuoruan/Chromium-Android/releases/latest)
+[![Build Status](https://travis-ci.org/kuoruan/Chromium-Android.svg)](https://travis-ci.org/kuoruan/Chromium-Android) [![Release Version](https://img.shields.io/github/release/kuoruan/Chromium-Android.svg)](https://github.com/kuoruan/Chromium-Android/releases/latest) [![Latest Release Download](https://img.shields.io/github/downloads/kuoruan/Chromium-Android/latest/total.svg)](https://github.com/kuoruan/Chromium-Android/releases/latest)
 
 ### Introduction
 
@@ -29,17 +29,19 @@ Notice: If you have something wrong with build, try close instant run in Android
 
 If you want to update Chromium source, these steps may help:
 
-1. [Checking out and building Chromium for Android](https://chromium.googlesource.com/chromium/src/+/master/docs/android_build_instructions.md), to match our build settings, use [args.gn](tools/args.gn)
-2. Generate files for Android Studio with [this guide](https://chromium.googlesource.com/chromium/src/+/master/docs/android_studio.md)
-3. Sync files with [this script](tools/sync_chromium.sh)
-4. Replace all files in project with the new files.
+1. [Checking out and building Chromium for Android](https://chromium.googlesource.com/chromium/src/+/master/docs/android_build_instructions.md), to match our build settings, use [tools/args.gn](tools/args.gn)
+2. Generate files for Android Studio with offical guide: [Android Studio](https://chromium.googlesource.com/chromium/src/+/master/docs/android_studio.md)
 
-Notice:
+	- After that, you can find some ```build.gradle``` files in ```[BUILD_TARGET]/gradle```, which defines the Java sources for Chromium.
 
-- Replace `BASE_DIR` in script with your Chromium src dir.
-- Replace `RELEASE_DIR` in script with your build dir.
-- `PRO_DIR` is the dir where new files will copied to.
-- Sync script may out of date that you need edit it yourself.
+3. Try sync files with script: [tools/sync_chromium.sh](tools/sync_chromium.sh)
+
+	- Replace `BASE_DIR` in script with your Chromium src dir.
+	- Replace `RELEASE_DIR` in script with your build dir.
+	- `PRO_DIR` is the dir where new files will copied to.
+	- **Sync script may out of date that you need modify it yourself**.
+
+4. Finally, replace all files in this project with the new files.
 
 ### Thanks