1.1.2: Dynamic response classes.

Node.js 16.x - Replacement of the missing node 16 fetch by own GitLab.Request
Add to GitLab.Options - fetchMethod - fetch, axios, node-fetch ... etc.
new GitLab.Options({
privateToken: process.env.GIT_TOKEN,
projectId: process.env.GIT_PID,
fetchMethod: GitLab.Request
})