Update README.md: use pip3 (#352)

ink-ru · web-flow · commit 54ba8079163b · 2020-09-11T16:31:08.000+03:00
diff --git a/README.md b/README.md
@@ -21,3 +21,4 @@ print(vk.wall.post(message='Hello world!'))
 Установка
 ------------
     $ pip install vk_api
+    $ pip3 install vk_api
