Update CHANGELOG.md

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CHANGELOG.md

@@ -19,6 +19,9 @@
 * Correctly estimate the number of row entries in the matrix backend based on
     the DG discretization and proper static blocking. This can lead to a
     performance improvement for large problems.
+* VTK output is now written _before_ the grid is adapted. Previously, the output
+    displayed the adapted grid and not the one the solution was computed on.
+* Grid adaptation is skipped after computing the final solution.
 
 
 ## 1.1.0 (2018-07-27)