[FIX] release docs

[ravinkohli]

Small fix to add a new line for the change log in release.rst.

[codecov]

Codecov Report

Merging #453 (0e574af) into master (a784abb) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #453   +/-   ##
=======================================
  Coverage   85.49%   85.50%           
=======================================
  Files         231      231           
  Lines       16303    16303           
  Branches     3009     3009           
=======================================
+ Hits        13939    13940    +1     
+ Misses       1526     1524    -2     
- Partials      838      839    +1     

Impacted Files	Coverage Δ
...feature_preprocessing/SelectRatesClassification.py	89.13% <0.00%> (-6.53%)	⬇️
autoPyTorch/datasets/base_dataset.py	80.28% <0.00%> (ø)
...one/forecasting_encoder/flat_encoder/MLPEncoder.py	91.04% <0.00%> (ø)
...ecasting_encoder/seq_encoder/TransformerEncoder.py	95.74% <0.00%> (+2.12%)	⬆️
...re_preprocessing/SelectPercentileClassification.py	94.73% <0.00%> (+5.26%)	⬆️

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