chore: fix typescript settings for publish

[yoshinorin]

Sorry, I made some mistake. We have to merge this PR before release v4.0.0 #125

Before fix

$ npm publish --dry-run
npm WARN config global `--global`, `--local` are deprecated. Use `--location=global` instead.
npm notice 
npm notice 📦  [email protected]
npm notice === Tarball Contents ===
npm notice 1.1kB LICENSE
npm notice 877B  README.md
npm notice 4.0kB dist/log.js
npm notice 3.2kB lib/log.ts
npm notice 1.4kB package.json
npm notice === Tarball Details ===
npm notice name:          hexo-log
npm notice version:       4.0.0
npm notice filename:      hexo-log-4.0.0.tgz
npm notice package size:  3.3 kB
npm notice unpacked size: 10.5 kB
npm notice shasum:        2845040d36e9a6b2ef8ad402c9d1a8f987cca78a
npm notice integrity:     sha512-FqUD2oBgbuhAg[...]rh0LCuYC+fvQA==
npm notice total files:   5
npm notice
+ [email protected]

After fix

npm publish --dry-run
npm WARN config global `--global`, `--local` are deprecated. Use `--location=global` instead.
npm notice 
npm notice 📦  [email protected]
npm notice === Tarball Contents ===
npm notice 1.1kB LICENSE
npm notice 877B  README.md
npm notice 753B  dist/log.d.ts
npm notice 4.0kB dist/log.js
npm notice 3.8kB dist/log.js.map
npm notice 1.4kB package.json
npm notice === Tarball Details ===
npm notice name:          hexo-log
npm notice version:       4.0.0
npm notice filename:      hexo-log-4.0.0.tgz
npm notice package size:  3.8 kB
npm notice unpacked size: 11.8 kB
npm notice shasum:        c38266562d0e987608f976d712c2742e550d7c0e
npm notice integrity:     sha512-ksaU160mzE2ON[...]XR+upMuEHLBDg==
npm notice total files:   6
npm notice
+ [email protected]

[coveralls]

Coverage remained the same at 98.413% when pulling d3a6d67 on fix/typescript-settings into e0896fa on master.