Updated README.md maintainer

ISLANDORA-7.x-1.10 Release

What does this Pull Request do?

Changed the maintainer from Diego Pino to Will Panting on the README.md .

What's new?

Will Panting is the maintainer. 

Additional Notes:

Tag (@ mention) interested parties or, if unsure, @Islandora/7-x-1-x-committers

README.md

@@ -64,7 +64,7 @@ Having problems or solved a problem? Check out the Islandora google groups for a
 
 Current maintainers:
 
-* [Diego Pino](https://github.com/DiegoPino)
+* [William Panting](https://github.com/willtp87)
 
 ## Development