image sizing

Signed-off-by: Sean P. Goggins <s@goggins.com>

Author: sgoggins

README.md

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 # augur-utilities
 
-![image](./augur-utilties.png)
+![image](./augur-utilties.jpg)
 
 Utilities for working with Augur data. 
 1. [Tod Do Group Repo Linter](./repo_linter/)