Update README.md

注明python3版本要求，避免无法通过pip安装依赖

README.md

@@ -5,7 +5,7 @@
 ### 文件说明
 
 * bwm.py 程序文件python2版本
-* bwmforpy3.py 程序文件python3版本
+* bwmforpy3.py 程序文件python***3.6***版本
 * hui.png 无水印的原图
 * wm.png 水印图
 * hui_with_wm.png 有盲水印的图
@@ -52,7 +52,7 @@ pip install -r requirements.txt
 注意程序python2和python3版本的加解密结果会有所不同，主要原因是python2和python3 random的算法不同，如果要让python3兼容python2的random算法请加 --oldseed参数。
 
 
-Note that the enode and decode results of the python2 and python3 versions of the program will be different. The main reason is that the python2 and python3 random algorithms are different. If you want to make python3 compatible with the random algorithm of python2, please add the --oldseed parameter.
+Note that the encode and decode results of the python2 and python3 versions of the program will be different. The main reason is that the python2 and python3 random algorithms are different. If you want to make python3 compatible with the random algorithm of python2, please add the --oldseed parameter.
 
     Usage: python bwm.py <cmd> [arg...] [opts...]
       cmds: