[now-go] Fix import for go-bridge

[styfle]

Somehow, PR #3973 broke Go since the bridge is imported from this repo's master branch.

Go has very strict file name constraints and the file [...path].js is not compatible.

Here's what a @now/go deployment error message looks like:

Error: Command failed: go mod tidy
go: finding github.com/zeit/now latest
go: downloading github.com/zeit/now v0.0.0-20200326223129-c91495338d5e
go: extracting github.com/zeit/now v0.0.0-20200326223129-c91495338d5e
-> unzip /tmp/5a0676f5/pkg/mod/cache/download/github.com/zeit/now/@v/v0.0.0-20200326223129-c91495338d5e.zip: malformed file path "packages/now-next/test/fixtures/22-ssg-v2-catchall/pages/[...path].js": double dot
handler imports
github.com/zeit/now/utils/go/bridge: unzip /tmp/5a0676f5/pkg/mod/cache/download/github.com/zeit/now/@v/v0.0.0-20200326223129-c91495338d5e.zip: malformed file path "packages/now-next/test/fixtures/22-ssg-v2-catchall/pages/[...path].js": double dot

The solution is to move Go Bridge into a separate repository: https://github.com/zeit/now-go-bridge

This will also have the side effect of speeding up Go imports because the repo will be much smaller.

[codecov]

Codecov Report

Merging #3976 into master will not change coverage by %.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3976   +/-   ##
=======================================
  Coverage   13.59%   13.59%           
=======================================
  Files         278      278           
  Lines        9963     9963           
  Branches     1301     1301           
=======================================
  Hits         1354     1354           
  Misses       8516     8516           
  Partials       93       93           

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[styfle]

Ok this didn't work because we can't pin a version unfortunately.

Error: can only use path@version syntax with 'go get'

I'm going to move Go Bridge to a separate repo.

[caarlos0]

Lgtm