Vulnerabilities fix

[popa-marius]

Currently there are these vulnerabilities present in the current dependencies of js-yaml and minimist:

• https://www.npmjs.com/advisories/813
• https://www.npmjs.com/advisories/788
• https://www.npmjs.com/advisories/1179
• https://www.npmjs.com/advisories/1179

I created this PR as a fix #89

A need for update PRs could be avoided in the future if there is a switch done from fixed dependency versioning to a patch versioning scheme ~.

[popa-marius]

Since I did not see any activity on this Issue or the PR I am considering the project inactive.

If there are others like me, which do no want to switch to an alternative of this project, but want the vulnerabilities fixed, I created a fork with the fixes and also released it so they can be used directly from NPM:

https://www.npmjs.com/package/@popa-marius/pushstate-server
https://github.com/popa-marius/pushstate-server