We're encountering a lot of `Cannot read property 'scrollTop' of null` errors (https://github.com/mdbootstrap/perfect-scrollbar/issues/835). This was fixed in perfect-scrollbar 1.5.1 (https://github.com/mdbootstrap/perfect-scrollbar/releases/tag/1.5.1), but looking at the /dist/ of 1.4.1 published on NPM, version 1.5.0 is still bundled (like here https://github.com/Binaryify/vue-custom-scrollbar/blob/master/dist/vueScrollbar.umd.min.js#L3). Could we bump the perfect-scrollbar version, rebuild and publish? Thank you