[DOC] update readme (#180)

README.md

@@ -40,6 +40,10 @@ The `learnware` package provides a fundamental implementation of the central con
 
 In addition, the `learnware` package serves as the engine for the [Beimingwu System](https://bmwu.cloud) and can be effectively employed for conducting experiments related to learnware.
 
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+[1] Zhi-Hua Zhou. Learnware: on the future of machine learning. _Frontiers of Computer Science_, 2016, 10(4): 589–590 <br/>
+[2] Zhi-Hua Zhou. Machine Learning: Development and Future. _Communications of CCF_, 2017, vol.13, no.1 (2016 CNCC keynote)
+
 ## Learnware Paradigm
 
 A learnware consists of a high-performance machine learning model and specifications that characterize the model, i.e., "Learnware = Model + Specification".
@@ -407,8 +411,3 @@ We appreciate all contributions and thank all the contributors!
 ## About us
 
 Please visit [LAMDA's official website](http://www.lamda.nju.edu.cn/).
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-[1] Zhi-Hua Zhou. Learnware: on the future of machine learning. _Frontiers of Computer Science_, 2016, 10(4): 589–590 <br/>
-[2] Zhi-Hua Zhou. Machine Learning: Development and Future. _Communications of CCF_, 2017, vol.13, no.1 (2016 CNCC keynote)