refactor: remove redundant code from dupefilter middleware

Merge pull request #32 from tech-engine/dev

chore: bump to go v1.22

update: goscrapy cli settings.tmpl template

hotfix: reset header instead of setting to nil in request reset to ov…

…ercome nill header issue

Merge pull request #26 from tech-engine/dev

Feature: Added css & xpath node selectors

refactor: renamed NewSpider() in goscrapy cli spider template to New()

update: goscrapy-cli to add settings.go when creating a new project.

refactor: export2JSON to use struct instead of using builder pattern …

…for configuration

bugfix: trying to read cookies from nil resp leads to blocking in mul…

…ticookiejar middleware

refactor: make Retry middleware variadic to make options passing opti…

…onal