Update README

README.md

@@ -1,9 +1,9 @@
-![vim-plug](https://raw.githubusercontent.com/junegunn/vim-plug/master/plug.png)
+<img src="https://raw.githubusercontent.com/junegunn/vim-plug/master/plug.png" height="56" alt="vim-plug">
 [![travis-ci](https://travis-ci.org/junegunn/vim-plug.svg?branch=master)](https://travis-ci.org/junegunn/vim-plug)
 
 A minimalist Vim plugin manager.
 
-![](https://raw.githubusercontent.com/junegunn/i/master/vim-plug/installer.gif)
+<img src="https://raw.githubusercontent.com/junegunn/i/master/vim-plug/installer.gif" height="450">
 
 ### Pros.