CIでのバージョン解決方法を修正

[shinsuke-mat]

PR #696 #694 によるCI failを修正．

CI failはver解決方法のミスが原因． ver解決方法は以下3択だがCが一番マシという判断．

A. CIタスクbuild-artifactsでverを取り出しgenerate-change-logに渡す

694 以前の状態．

cons: 上記2つのタスク間で強い依存を持ってしまう

B. generate-change-log で gradlew する

cons: このタスクのcontainerがnodeなのでjavaがそもそも使えない（#696 でのfailの原因）

C. generate-change-log で sed する

$ cat gradle.properties | grep currentVersion | cut -d'=' -f2
1.5.4

cons: 正規表現

[codecov-io]

Codecov Report

Merging #697 into master will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #697   +/-   ##
=========================================
  Coverage     78.48%   78.48%           
  Complexity      880      880           
=========================================
  Files           144      144           
  Lines          3454     3454           
  Branches        254      254           
=========================================
  Hits           2711     2711           
  Misses          638      638           
  Partials        105      105

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