Update PROTOCOL-WEB.md

Features included in this merge:
- Added script to build and upload docker image for matrix test.
- Added script to create test cases and created go__master testcases based on it.
- Created dictionary for runtimes and gRPC releases for supported languages.
- Added go 1.7 and 1.8 Dockerfile/templates.

See tools/interop_matrix/README.md for details.

Dont concatenate strings when status is OK

Added a binary trailer test

Features included in this merge:
- Added script to build and upload docker image for matrix test.
- Added script to create test cases and created go__master testcases based on it.
- Created dictionary for runtimes and gRPC releases for supported languages.
- Added go 1.7 and 1.8 Dockerfile/templates.

See tools/interop_matrix/README.md for details.

Allow specifying DNS server to query for c-ares via URI authority.

Clarify the content type requirement (for message formats).

Add trace protector to flag

Set Frame Size to Bytes per Microsecond

Fix minor problems in server backward compatibility

Make cq_verifier output more readable

Fix some races in tests

Add MacOS interop and UBSan C to internal CI

Add unary fullstack trickle to bm json

Blanket suppress protobuf from ubsan runs

C++ compatibility fixes

Implement grpclb drop support.

Upmerge v1.3.x branch to master

C#: Dont use non-blittable types in native method signatures