Update CHANGELOG.md [skip travis]

CHANGELOG.md

@@ -4,8 +4,11 @@
 
  - Cleaner axis limits for `features_hist` and `features_hist_v2`: xmin and xmax are now limited in characters to avoid clutter in plots
  - Docs state title will set to `title_mode` if not one of `'grads', 'outputs'`, but this was false; fixed now. 
- - `title_mode` renamed to `title`.
  - Created `CHANGELOG.md`
+
+#### BREAKING
+
+ - `title_mode` renamed to `title`.
 
 
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@@ -109,4 +112,4 @@ For L2-norm, set `norm_fn = (np.sqrt, np.square) = (outer_fn, inner_fn)`, which
  - Improved `Input` layer exclusion for `_id='*'`
  - Added note + tip to `get_gradients` on performance
  - Extended GPU detection method in tests to work with TF2.2
-
+