Merge pull request #349 from idrawjs/dev-v0.4

chore: bump version 0.4.0-beta.39

Merge pull request #347 from idrawjs/dev-v0.4

chore: bump version 0.4.0-beta.38

Merge pull request #345 from idrawjs/dev-v0.4

chore: bump version 0.4.0-beta.37

Merge pull request #342 from idrawjs/dev-v0.4

chore: bump version 0.4.0-beta.36

Merge pull request #340 from idrawjs/dev-v0.4

chore: bump version 0.4.0-beta.35

Merge pull request #338 from idrawjs/dev-v0.4

chore: bump version 0.4.0-beta.34

Merge pull request #336 from idrawjs/dev-v0.4

chore: bump version 0.4.0-beta.33

Merge pull request #334 from idrawjs/dev-v0.4

chore: bump version 0.4.0-beta.32

Merge pull request #332 from idrawjs/dev-v0.4

feat: support custom style of middlewares

Merge pull request #331 from idrawjs/dev-v0.4

chore: bump version 0.4.0-beta.30