Fix typo in DESCRIPTION for CRAN release

- fixes #151
- will be committed to CRAN as same-version update (per conversation with maintainers)

Author: jaspercooper

DESCRIPTION

@@ -9,7 +9,7 @@ Authors@R: c(person("Graeme", "Blair", email = "graeme.blair@ucla.edu", role = c
              person("Clara", "Bicalho", email = "clarabmcorreia@gmail.com", role = c("aut")),
              person("Neal", "Fultz", email = "nfultz@gmail.com", role = c("aut")),
              person("Lily", "Medina", email = "lilymiru@gmail.com", role = c("aut")))
-Description: A simple interface to build designs using the 
+Description: A simple interface to build designs 
     using the package 'DeclareDesign'. In one line of code, users can specify 
     the parameters of individual designs and diagnose their properties.
     The designers can also be used to compare performance of a given design