Fix build - remove TODOs

[timja]

#63 (comment)

[codecov]

Codecov Report

Merging #64 into master will not change coverage.
The diff coverage is 0.00%.

@@            Coverage Diff            @@
##             master      #64   +/-   ##
=========================================
  Coverage     43.38%   43.38%           
  Complexity      190      190           
=========================================
  Files            18       18           
  Lines          1263     1263           
  Branches        192      192           
=========================================
  Hits            548      548           
  Misses          651      651           
  Partials         64       64           

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/hudson/plugins/plot/Plot.java	25.87% <0.00%> (ø)	30.00 <0.00> (ø)
src/main/java/hudson/plugins/plot/Series.java	81.81% <ø> (ø)	10.00 <0.00> (ø)

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