Add duplicate new line at end of file.

theories/program_logic/weakestpre.v

@@ -400,4 +400,3 @@ Section proofmode_classes.
             (WP e @ s; E1 {{ Φ }}) (WP e @ s; E2 {{ v, |={E2,E1}=> Φ v }})%I | 100.
   Proof. intros. by rewrite /ElimModal fupd_frame_r wand_elim_r wp_atomic. Qed.
 End proofmode_classes.
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