typo in readme

Author: UnixJunkie

README.md

@@ -7,7 +7,7 @@ Reference implementation of the Vanishing Ranking Kernels (VRK) method
 *Example ROC curve on a hold-out test set. The test set had 38 active
 molecules and 664 inactives. ROC AUC: 0.861; BEDROC AUC: 0.766; PR AUC: 0.678.
 The ROC curve is in purple; the precision-recall (PR) curve in cyan. The
-probability of activity given a raw score is the red curve obtained.
+probability of activity given a raw score is the red curve.
 The green curve is the number of actives divided by the
 number of decoys as a function of the scores filtering threshold.*