Merge pull request #3 from Yelrose/master

Add version description

README.md

@@ -63,10 +63,11 @@ PGL supports both Python 2 & 3
 
 ## Installation
 
-pip install pgl
-
-
+The current version of PGL is 0.1.0.beta. You can simply install it via pip.
 
+```sh
+pip install pgl
+```
 
 ## The Team
 

examples/graphsage/README.md

@@ -12,6 +12,7 @@ The reddit dataset should be downloaded from the following links and placed in d
 
 ### Dependencies
 
+- sklearn
 - paddlepaddle>=1.4 (The speed can be faster in 1.5.)
 - pgl