modify readme

+Beego
+=======
+Beego is an open source version of the scalable, non-blocking web server
+and tools that power SNDA. Documentation and downloads are
+available at https://github.com/xiemengjun/beego/wiki
+
+Beego is licensed under the Apache Licence, Version 2.0
+(http://www.apache.org/licenses/LICENSE-2.0.html).
+
+Installation
+============
+To install:
+
+    go install github.com/xiemengjun/beego
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