v1.2.1 - Allow single mapped reviewer

#30 Allow submit if a single reviewer is mapped
Change service name to GitP4Sync Service
Update documentation with build c

v1.2 - Mandatory Github checks

Adding support to prevent submit unless configured checks are successful, i.e. to ensure unit-tests or other Github checks are successful before developers can submit to Perforce.

To configure the required checks, update this key in setting.json:
"GithubChecks": [ "AzurePipelines" ]

You can add multiple entries to make more than one check required.

v1.1 - Impersonation and retry support

• Added impersonation support (login on behalf of perforce pass-protected users)
• Added retry support, to resubmit failed submit attempts