Update videojs (tested 5-7). Update Play, Seek, Pause Event

[spodlecki]

PR Description, what changed?

• Removed eslintcache file
• Adds a PR Template file GitHub
• Changing dependency requirements for VideoJS. We I tested backwards to VideoJS 5.20.5 (release Feb 13, 2018)
• The examples file will now display the version of videojs that we're using
• Tracking the seek event using seeking
• Updates pause event to depend on the videojs seeking() and/or scrubbing() functions
• Reset the onSecondsToLoad in the Play event when the video is ended

Steps for testing

• Change the videojs version from 5, 6, and 7.

yarn install
yarn start
open ./index.html