ci(travis): add build stages

[michael-ciniawsky]

Type

• CI

Issues

• None

SemVer

• Patch

[codecov]

Codecov Report

Merging #1467 into master will decrease coverage by 3.28%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1467      +/-   ##
==========================================
- Coverage   78.94%   75.66%   -3.29%     
==========================================
  Files           5        8       +3     
  Lines         494      678     +184     
  Branches      161        0     -161     
==========================================
+ Hits          390      513     +123     
- Misses        104      165      +61

Impacted Files	Coverage Δ
lib/OptionsValidationError.js	61.85% <0%> (-0.88%)	⬇️
lib/util/addDevServerEntrypoints.js	100% <0%> (ø)	⬆️
examples/util.js	81.81% <0%> (ø)
examples/cli/public/webpack.config.js	100% <0%> (ø)
bin/webpack-dev-server.js	62.77% <0%> (ø)
lib/Server.js	83.43% <0%> (+1.51%)	⬆️

---

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[codecov]

Codecov Report

Merging #1467 into master will decrease coverage by 3.35%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1467      +/-   ##
==========================================
- Coverage   78.94%   75.58%   -3.36%     
==========================================
  Files           5        8       +3     
  Lines         494      680     +186     
  Branches      161        0     -161     
==========================================
+ Hits          390      514     +124     
- Misses        104      166      +62

Impacted Files	Coverage Δ
lib/OptionsValidationError.js	61.85% <0%> (-0.88%)	⬇️
lib/util/addDevServerEntrypoints.js	100% <0%> (ø)	⬆️
examples/util.js	81.81% <0%> (ø)
examples/cli/public/webpack.config.js	100% <0%> (ø)
bin/webpack-dev-server.js	62.63% <0%> (ø)
lib/Server.js	83.43% <0%> (+1.51%)	⬆️

---

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 b445b68...4fd326b. Read the comment docs.