Chapter6: Import org.scalatest.MustMatches instead of org.scalatest.matchers.MustMatchers (deprecated)
Chapter8: Import scala.language.postfixOps
Chapter8: Refactor photoSpeed argument values into variable to eliminate redundancy and establish conformance with DRY
Merge pull request #14 from dusank/improvements-and-fixes-by-dusank

Improvements and fixes by dusank - Part 2