bugfix- #221, xcaddy skips minor updates of lexical submodules

[Jesssullivan]

Resolves #221

Current behavior:

• xcaddy skips minor updates of lexical submodules

Intended behavior:

• xcaddy will ingest logically tagged and / or latest modules when semantically updated or a new release is available to @latest.

To demo the bug:

git clone https://github.com/infogulch/xtemplate && cd xtemplate
xcaddy build --with github.com/infogulch/xtemplate-caddy@v0.2.2 --with github.com/infogulch/xtemplate=.
go get github.com/infogulch/xtemplate-caddy@v0.2.2

# this should fail, but does not:
xcaddy build --with github.com/infogulch/xtemplate-caddy@v0.2.5 --with github.com/infogulch/xtemplate=.

# note, this behavior cannot be replicated with major semantic changes, eg, v0 --> v1.

To demo the fix:

# get extant release
git clone https://github.com/jesssullivan/xcaddy && cd xcaddy
git checkout 221-fetch-uncached-modules
cd 221-xtemplate-caddy 
go mod tidy && go build -o xcaddy ./cmd/xcaddy

cd ../xtemplate
./xcaddy/xcaddy build --with github.com/infogulch/xtemplate-caddy@v0.2.5 --with github.com/infogulch/xtemplate=. # <-- successfully fails ^w^

[mholt]

Thank you! We can give this a try.

[mholt]

Although, the lint errors should probably be fixed first