Merge branch 'master' into v2 

Bump swagger-ui version to 4.11.1 & change default CDN to cdnjs 

Merge branch 'master' into v2 

Add NewNop method to create a no-operation interface 

Merge branch 'master' into v2 

Merge pull request #48 from jaehue/47 Add middleware to New() func

Merge branch 'master' into v2 

Bump swagger-ui version to 3.44.1 

Merge branch 'master' into v2 

Fix comment on method Add