Spelling change in README.md

Changed "tar balls" to "tarballs".

README.md

@@ -18,7 +18,7 @@ for changes and offers subsequent commands to interact with observed resources.
 
 K9s is available on Linux, OSX and Windows platforms.
 
-* Binaries for Linux, Windows and Mac are available as tar balls in the [release](https://github.com/derailed/k9s/releases) page.
+* Binaries for Linux, Windows and Mac are available as tarballs in the [release](https://github.com/derailed/k9s/releases) page.
 
 * For OSX using Homebrew
 
@@ -173,4 +173,4 @@ to make this project a reality!
 ---
 
 <img src="assets/imhotep_logo.png" width="32" height="auto"/> © 2018 Imhotep Software LLC.
-All materials licensed under [Apache v2.0](http://www.apache.org/licenses/LICENSE-2.0)
+All materials licensed under [Apache v2.0](http://www.apache.org/licenses/LICENSE-2.0)