Fixed date release of 4.5.0 in NEWS file.

NEWS

-Announcement for Dynare 4.5.0 (on 2013-12-16)
+Announcement for Dynare 4.5.0 (on 2017-06-11)
 =============================================
 
 We are pleased to announce the release of Dynare 4.5.0.
@@ -19,11 +19,6 @@ This release is compatible with MATLAB versions ranging from 7.3 (R2006b) to
 Here is the list of major user-visible changes:
 
 
-
-Dynare 4.5
-==========
-
-
  - Ramsey policy
 
    + Added command `ramsey_model` that builds the expanded model with