Path param should be allowed to exceed 20 chars.

First of all - I want to say thanks for sharing this project - it is very valuable.

Now my "issue":

Path param should be allowed to exceed 20 chars. (Ideally also would allow to contain "/". But I shouldn't mix up things.)

Limiting path to 20 makes it difficult to host multiple projects on the same allure server.

I aim to serve results of multiple projects for multiple branches and / or multiple pull-requests. Since path should not contain "/" - I aim to use path params with a patterns like these:

$module-name_$branch or
$module-name_$PR-number

The limit of 20 is reached quickly - would be nice to make it (much) longer.

kochetkov-ma / allure-server

Path param should be allowed to exceed 20 chars. #67