ecstatic version removed from npm

[matt-gadd]

Looks like old versions of ecstatic have been removed from the npm registry (perhaps due to: https://snyk.io/vuln/SNYK-JS-ECSTATIC-174543)

$ npm view ecstatic versions
[ '4.1.2' ]

npm ERR! code ETARGET
npm ERR! notarget No matching version found for ecstatic@^3.0.0
npm ERR! notarget In most cases you or one of your dependencies are requesting
npm ERR! notarget a package version that doesn't exist.
npm ERR! notarget
npm ERR! notarget It was specified as a dependency of 'http-server'
npm ERR! notarget

This affects http-server. There is no solution yet other than switching http-server out as ecstatic has breaking changes in 4.x
http-party/http-server#520

[thornjad]

See jfhbrook/node-ecstatic#255 and http-party/http-server#520, jfhbrook/node-ecstatic#256