fixes rails#188

Author: EOengineer

README.md

@@ -38,7 +38,7 @@ been updated in the last 30 days. The 30 days cutoff can be changed using the
 Configuration
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-The default assumes a `sessions` tables with columns:
+The default assumes a `sessions` table with columns:
 
 *  `id` (numeric primary key),
 *  `session_id` (string, usually varchar; maximum length is 255), and