Years in copyright examples updated to 2021

[petertrr]

What's done:

• Years updated

Fixme

• there are some incorrect fixing cases:
• • Additional blank line is inserted after rearranging comments
• • Sometimes, when year is still not changed, there is an NPE somewhere in year checking logic.
• Overall, it seems there are some cases that need to be fixed and covered with tests in year checking logic.

[codecov]

Codecov Report

Merging #687 (364213f) into master (62c5a01) will decrease coverage by 0.00%.
The diff coverage is 81.57%.

@@             Coverage Diff              @@
##             master     #687      +/-   ##
============================================
- Coverage     79.94%   79.94%   -0.01%     
- Complexity     1835     1839       +4     
============================================
  Files            87       87              
  Lines          4778     4801      +23     
  Branches       1544     1549       +5     
============================================
+ Hits           3820     3838      +18     
- Misses          239      241       +2     
- Partials        719      722       +3     

Flag	Coverage Δ	Complexity Δ
unittests	79.94% <81.57%> (-0.01%)	0.00 <5.00> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ	Complexity Δ
...qfn/diktat/plugin/gradle/DiktatJavaExecTaskBase.kt	91.22% <80.00%> (-2.53%)	17.00 <2.00> (+2.00)	⬇️
...cqfn/diktat/ruleset/rules/DiktatRuleSetProvider.kt	93.06% <81.48%> (-4.64%)	11.00 <3.00> (+2.00)	⬇️
...n/org/cqfn/diktat/plugin/gradle/DiktatExtension.kt	100.00% <100.00%> (ø)	6.00 <0.00> (ø)
...diktat/ruleset/rules/comments/HeaderCommentRule.kt	86.45% <0.00%> (+2.08%)	42.00% <0.00%> (ø%)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update c852602...364213f. Read the comment docs.

[orchestr7]

lgtm