Add DOI to Williamson paper

Per openjournals/joss-reviews#33.
EducationalTestingService · Jul 7, 2016 · 136133f · 136133f
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commit 136133f
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/paper.bib b/paper.bib
@@ -5,7 +5,8 @@ @article{Williamson2012
 pages = {2--13},
 title = {{A framework for evaluation and use of automated scoring}},
 volume = {31},
-year = {2012}
+year = {2012},
+doi = {10.1111/j.1745-3992.2011.00223.x}
 }
 
 @online{github_rsmtool,