integration: mod bumps

Merge pull request #105 from aadedamola/add-optional-field-support

proto gen: support optionals for proto syntax 3

doc: fixed example go.mod

Merge pull request #103 from bullgare/ast-checks-for-source-relative-…

…fixed

Fixes AST checks for source relative implementation path - before it was checking the path relative to proto file.

fixed tests

Merge pull request #90 from bullgare/swagger-as-separate-file

Optional generation of separate swagger file

regenerated doc/example/pb

cleaned up generated tests in /integration

go mod tidy

go mod tidy