fix(test): cannot collect *.vue coverage

[nogic1008]

In jest 25.1.0, coverage data is only collected from JavaScript files.
This PR reverts jest to 24 for workaround.

Before

------------------|---------|----------|---------|---------|-------------------
File              | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s 
------------------|---------|----------|---------|---------|-------------------
All files         |     100 |      100 |     100 |     100 |                   
 plugins          |     100 |      100 |     100 |     100 |                   
  environments.ts |     100 |      100 |     100 |     100 |                   
  vuex-module.ts  |     100 |      100 |     100 |     100 |                   
 store            |     100 |      100 |     100 |     100 |                   
  counter.ts      |     100 |      100 |     100 |     100 |                   
  index.ts        |     100 |      100 |     100 |     100 |                   
 types            |       0 |        0 |       0 |       0 |                   
  vue-shim.d.ts   |       0 |        0 |       0 |       0 |                   
 utils            |     100 |      100 |     100 |     100 |                   
  test-utils.ts   |     100 |      100 |     100 |     100 |                   
------------------|---------|----------|---------|---------|-------------------

After

------------------|----------|----------|----------|----------|-------------------|
File              |  % Stmts | % Branch |  % Funcs |  % Lines | Uncovered Line #s |
------------------|----------|----------|----------|----------|-------------------|
All files         |      100 |      100 |      100 |      100 |                   |
 components       |      100 |      100 |      100 |      100 |                   |
  Card.vue        |      100 |      100 |      100 |      100 |                   |
  Counter.vue     |      100 |      100 |      100 |      100 |                   |
 layouts          |      100 |      100 |      100 |      100 |                   |
  default.vue     |      100 |      100 |      100 |      100 |                   |
 pages            |      100 |      100 |      100 |      100 |                   |
  environment.vue |      100 |      100 |      100 |      100 |                   |
  index.vue       |      100 |      100 |      100 |      100 |                   |
  inspire.vue     |      100 |      100 |      100 |      100 |                   |
 plugins          |      100 |      100 |      100 |      100 |                   |
  environments.ts |      100 |      100 |      100 |      100 |                   |
  vuex-module.ts  |      100 |      100 |      100 |      100 |                   |
 store            |      100 |      100 |      100 |      100 |                   |
  counter.ts      |      100 |      100 |      100 |      100 |                   |
  index.ts        |      100 |      100 |      100 |      100 |                   |
 types            |        0 |        0 |        0 |        0 |                   |
  vue-shim.d.ts   |        0 |        0 |        0 |        0 |                   |
 utils            |      100 |      100 |      100 |      100 |                   |
  test-utils.ts   |      100 |      100 |      100 |      100 |                   |
------------------|----------|----------|----------|----------|-------------------|

Ref

• Vue SFCs not included in coverage reports vuejs/vue-jest#217
• Coverage is only collected from javascript files jestjs/jest#9490

[commit-lint]

Chore

• deps-dev: revert jest to 24 (5beb202)

Contributors

@nogic1008

[codecov]

Codecov Report

Merging #48 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master    #48   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           5     11    +6     
  Lines          37     67   +30     
  Branches        4      4           
=====================================
+ Hits           37     67   +30

Impacted Files	Coverage Δ
pages/index.vue	100% <0%> (ø)
pages/inspire.vue	100% <0%> (ø)
components/Counter.vue	100% <0%> (ø)
pages/environment.vue	100% <0%> (ø)
components/Card.vue	100% <0%> (ø)
layouts/default.vue	100% <0%> (ø)

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