Envoy protos commit SHA: 97dfffde06115e58261dbab3707ad70d5c86ba1f

Changed

• Documentation rewrite in the /docs folder (#520)
• Updated go module version to 1.16 (#536)
• Exposed ApiTypePrefix (#553)

Added

• Initial support of the Virtual Host Discovery Service VHDS (#529)
• Added linear cache method UpdateResources (#546)

Fixed

• Scoped routes consistency check (#515)
• Scoped routes references (#518)
• Fixed go routine leaks in server unit tests (#519)
• Linear cache no longer requires linear time for applying delta updates (#547)