message: Update README (Binary package).
diff: @@ -435,22 +435,27 @@ echo 'use ' . (microtime(true) - $s) . ' s';
  > As with any open source project, Swoole always provides the most reliable stability and the most powerful features in **the latest released version**. Please ensure as much as possible that you are using the latest version.
  -### Requirements
  +### 1. Binary package (beginners + dev-env)
  -- Linux, OS X and basic Windows support (thanks to Cygwin)
  +See our [download page](https://www.swoole.com/page/download)
  +
  +### Compilation Requirements
  +
  +- Linux, OS X or Cygwin, WSL
  - PHP 7.0.0 or later (The higher the version, the better the performance.)
  - GCC 4.8 or later
  -### 1. Install via pecl (beginners)
  +### 2. Install via pecl (beginners)
  ```shell
  pecl install swoole
  ```
  -### 2. Install from source (recommended)
  +### 3. Install from source (recommended)
  +
  +> Please download the source files from [Releases](https://github.com/swoole/swoole-src/releases)
  ```shell
  -git clone https://github.com/swoole/swoole-src.git && \
  cd swoole-src && \
  phpize && \
  ./configure && \
  @@ -465,11 +470,10 @@ After compiling and installing to the system successfully, you need to add a new
  > for example: `./configure --enable-openssl --enable-sockets`
  -- `--enable-openssl`
  +- `--enable-openssl` or `--with-openssl-dir=DIR`
  - `--enable-sockets`
  -- `--enable-http2`, `--with-nghttp2-dir=/path/to` (need nghttp2)
  -- `--enable-mysqlnd` (need mysqlnd)
  -- `--enable-async-redis`, `--with-hiredis-dir=/path/to` (need hiredis, build-in in v4.2.6 or later)
  +- `--enable-http2`
  +- `--enable-mysqlnd` (need mysqlnd, it just for supporting `$mysql->escape` method)
  ### Upgrade
  