OpenJDK14から16に変更 #19 + CIをtag push式に変更 #20

[jiro4989]

jiro4989/TKoolFacetileMaker2#50 と同じことやった。

ただし上記リポジトリと違って、本リポジトリにはテストコードがないし、Coverageも取れないので、CIジョブからCoverage取得処理を削除した。

close #19 , close #20

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@eee5eb9). Click here to learn what that means.
The diff coverage is 0.00%.

❗ Current head b508ab8 differs from pull request most recent head c91e326. Consider uploading reports for the commit c91e326 to get more accurate results

@@           Coverage Diff            @@
##             master     #21   +/-   ##
========================================
  Coverage          ?   0.00%           
========================================
  Files             ?      24           
  Lines             ?    1087           
  Branches          ?      56           
========================================
  Hits              ?       0           
  Misses            ?    1087           
  Partials          ?       0           

Impacted Files	Coverage Δ
...c/main/java/com/jiro4989/tkite/MainController.java	0.00% <0.00%> (ø)
...java/com/jiro4989/tkite/image/OutputImagePane.java	0.00% <0.00%> (ø)
.../main/java/com/jiro4989/tkite/util/ImageUtils.java	0.00% <0.00%> (ø)
...main/java/com/jiro4989/tkite/util/RecentFiles.java	0.00% <0.00%> (ø)

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