Deprecate the Pkg.generate function

[DilumAluthge]

Now that JuliaCI/PkgTemplates.jl#61 has been merged, PkgTemplates.jl no longer uses Pkg.generate.

Therefore, I think that we should officially deprecate Pkg.generate and direct users to PkgTemplates.jl. This will allow us to remove Pkg.generate in Julia 2.0.

This pull request adds the deprecation warning to Pkg.generate.

[codecov]

Codecov Report

Merging #1496 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1496      +/-   ##
==========================================
+ Coverage   86.73%   86.73%   +<.01%     
==========================================
  Files          25       25              
  Lines        5451     5452       +1     
==========================================
+ Hits         4728     4729       +1     
  Misses        723      723

Impacted Files	Coverage Δ
src/generate.jl	100% <100%> (ø)	⬆️

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[aminya]

Agree. PkgTemplate has much more features

[DilumAluthge]

Bump. Any opposition to deprecating the Pkg.generate function?

[rapus95]

@DilumAluthge We'll also lose the REPL mode integration which is VERY convenient. Is there any chance that PkgTemplates.jl can hook into the REPL mode (including pkg"generate" macro)?

[DilumAluthge]

I'm closing this as stale. We can revisit in the future.