Testing

[piraces]

Start unit testing along the project.
List of methods untested (in progress):

• pkg/feed/feed.go: 98.9% of statements
• pkg/helpers/helpers.go: 100% of statements
• pkg/events/events.go: 100% of statements
• pkg/replayer/replayer.go
• internal/handlers/handlers.go
• cmd/rsslay/main.go