update gemspec

updates to address security vulnerabilities identified by Dependabot

Revert "Revert "Merge pull request #136 from pivotal-cf/mimemagic-test""

This reverts commit 458bc4a.

Add a new function in support of product variables: set_title_no_spaces

use nokogiri 1.8.2

Merge branch 'master' of github.com:pivotal-cf/bookbinder

remove inactive label

Bump version

Bump version

- So pipelines pick up template app changes.
- Sneakily give myself credit for all these great commits :)

bump gemspec