Bump version to 0.55.1

[imaNNeo]

• BUGFIX (by @ateich): Fix infinite loop in RadarChart when all values in RadarDataSet are equal, radar chart crash #882.
• BUGFIX (by @ateich): Fix uneven titles in RadarChart when using titlePositionPercentageOffset, RadarChart titlePositionPercentageOffset is uneven across titles in version 0.55.0 #1074.
• BUGFIX (by @imaNNeoFighT): Fix PieChart single section stroke issue, No border on pie chart with a single section #1089

[codecov]

Codecov Report

Merging #1111 (935a679) into master (becd7bd) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1111   +/-   ##
=======================================
  Coverage   86.21%   86.21%           
=======================================
  Files          45       45           
  Lines        2821     2821           
=======================================
  Hits         2432     2432           
  Misses        389      389           

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