add spec for `{{ }}` in pre, code block
use fix/gemspec-require-paths branch to run test
do not replace `{{ }}` to plugin call in pre, code block
Revert "use fix/gemspec-require-paths branch to run test"

This reverts commit cd99d4c46b9e10d2eb0b59572d73b95243311209.
Merge pull request #9 from minimum2scp/fix/plugin-call-in-pre

do not replace `{{ }}` to plugin call in pre, code block