Update Version to 1.4.7

• Add Session Custom Attributes for Events (#559) (7b97000)
• ci: Add Standard Dependapot Workflows and Contribution notes (#562) (9a2f6fa)

Update Version to 1.4.6

• Bugfix: Fix error when rebuilding dist folder

Update Version to 1.4.5

• Bugfix: Prevent Total Ad Time from being Doubled
• Clean up formatting and linting

Update Version to 1.4.4

• Revise playhead position to be optional and null on init

Update Version to 1.4.3

• DEPRECATION: Replace MediaContentEnd with ContentEnd
• Bump versions of npm dependencies

Update version to 1.4.2

• Add new StreamType

Update version to 1.4.1

• Add Summary Events

Update version to 1.4.0

• Add Ad Position and Revise Placement

Update version to 1.3.0

• Add Travis CI
• Add NYC Code Coverage
• Split Session into a new file structure

Update version to 1.2.0

• Add support for optional parameters in MediaSession Log Methods
• Add custom attributes to MediaSession and MediaEvent
• Add currentPlayheadPosition to optional parameters in MediaSession and MediaEvent
• Resolve issue with QoS state