Fix typo in README

Author: jakevdp

README.md

@@ -2,6 +2,6 @@
 
 This is a repository for demonstrating the process of doing a pull request.
 
-The README is a useful file for including general informnation about the repository and its contents.
+The README is a useful file for including general information about the repository and its contents.
 It is rendered using [markdown](https://daringfireball.net/projects/markdown/), which is essentially a
 way to create readable plain-text documents that can be rendered as web pages or other media formats.