Trellis 0.9.3

• Nginx role improvements: use more h5bp configs (#428)
• Add global deploy_before and deploy_after hooks (#427)
• Fix HSTS headers (#424)
• Notify Windows users about SSH forwarding (#423)
• Use append_privs for WP DB privileges (#422)
• Stop WP cron job emails (#421)
• Add WP-CLI bash completion script (#407)
• Add Composer config github-oauth variable (#402)
• Fix copy project local files in example hook (#404)
• Update cron variable to match Bedrock (#394)
• Add deploy_build_before example hook for theme assets (#397)
• Use curl instead of dig for IP lookups (#390)
• Update SSL cipher suite (#386)
• Support for other Vagrant providers (VirtualBox, VMWare, Parallels) (#340)
• Specify versions for Ansible Galaxy requirements (#385)
• Adds ability to configure HSTS headers with site variables. (#388)