release: bumped version to 0.2, because cli args changed a lot in 0.1.17

Import argparse src files directly, it's convenient for people who
download source tarball from github.

README.md

@@ -19,7 +19,7 @@ This software is modified from
 Installation
 ============
 
-Install [libsodium](https://github.com/jedisct1/libsodium) and libevent2 first.
+Install [libsodium](https://github.com/jedisct1/libsodium) and [libevent](http://libevent.org/) 2 first.
 
 On Linux:
 
@@ -192,6 +192,8 @@ This also allows upgrades with zero downtime.
 中文文档
 ========
 
+注：第三方文档可能未及时与最新版本同步，以 README.md 为准。
+
 - CentOS/Debian/Ubuntu 下编译 dnscrypt-wrapper: http://03k.org/centos-make-dnscrypt-wrapper.html
 - dnscrypt-wrapper 使用方法: http://03k.org/dnscrypt-wrapper-usage.html
 

version.h

@@ -2,6 +2,6 @@
 #ifndef VERSION_H
 #define VERSION_H
 
-const char *the_version = "0.1.17";
+const char *the_version = "0.2";
 
 #endif