Update INSTALL.md (#867)

If you are not export a directory that contains the "activate" file to $PATH, it will show "activate: No such file or directory". So conda activate is more preferable.
cizhenshi · Jun 25, 2019 · abc5061 · abc5061
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commit abc5061
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/INSTALL.md b/INSTALL.md
@@ -23,7 +23,7 @@ a. Create a conda virtual environment and activate it. Then install Cython.
 
 ```shell
 conda create -n open-mmlab python=3.7 -y
-source activate open-mmlab
+conda activate open-mmlab
 
 conda install cython
 ```