chore(main): release 0.3.1

:robot: I have created a release beep boop

implement traefik github oauth plugin (d3be0a5)
implement traefik github oauth server app (7a7acdf)
middleware: add log (789e4cf)
middleware: message when api secret key is invalid (6138346)
middleware: use github.com/dghubble/sling as http client (81f461f)
server: add log (48cf8ea)
server: return request error message in json (4c1eac9)
server: use chi-router instead of gin server (e862713)
set no cache headers (316878f)
traefik-plugin: ensure the correct is always sent and add local dockerfile for testing (0fa2208)
update vendor packages and add chi router (d021f58)
use httpin to get the correct form/json fields (0f2f511)
vendor: update vendor packages (0b5975d)

change package name to avoid conflicts (f7bef93)
ignore changes to the dist folder (2f91dd8)
middleware: redirect only on get requests (61af42c)
server: fix incorrect use of context (788a2b0)
server: Fix logger middleware log fields (3ccd7e3)

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