v0.14.0

Fixes:

• Improve error message when locked version is missing in source. (#466, thanks @straight-shoota)
• Fix touch install_path to not accidentally create file. (#478, thanks @straight-shoota)

Features:

• Add --frozen and --without-development CLI flags. (#473, thanks @straight-shoota)
• Add --skip-postinstall cli option to install and update. (#475, thanks @bcardiff)
• Treat github sources as case insensitive. (#471, thanks @stakach)

Others:

• Rewrite manpages in Asciidoc. (#262, thanks @straight-shoota)
• CI improvements and housekeeping. (#454, #464, thanks @j8r, @Sija)
• Bump crystal-molinillo to 0.2.0. (#476, thanks @bcardiff)