🐛 Fix changelog rendering

[acabarbaye]

Description

Fix the problem with changelog generation which was due to this error in the underlying tool twisted/towncrier#180.

Test Coverage

• This change is covered by existing or additional automated tests.
• Manual testing has been performed (and evidence provided) as automated testing was not feasible.
• Additional tests are not required for this change (e.g. documentation update).

[codeclimate]

Code Climate has analyzed commit 4ae3f43 and detected 0 issues on this pull request.

View more on Code Climate.

[rosiemiller2]

Good to know to keep an eye out for things like this. Thanks Adrien!

[codecov]

Codecov Report

Merging #43 into master will not change coverage by %.
The diff coverage is 45.83%.

@@           Coverage Diff           @@
##           master      #43   +/-   ##
=======================================
  Coverage   63.17%   63.17%           
=======================================
  Files          26       26           
  Lines        1499     1499           
=======================================
  Hits          947      947           
  Misses        552      552           

Impacted Files	Coverage Δ
mbed_tools_ci_scripts/report_third_party_ip.py	38.70% <27.27%> (ø)
mbed_tools_ci_scripts/tag_and_release.py	35.18% <44.44%> (ø)
mbed_tools_ci_scripts/_version.py	100.00% <100.00%> (ø)