Fix `gem.packages` install command.
Found by expanding the tests. This file hasn't been touched in a *long* time so I don't suppose anyone uses pyinfra to `gem install` yet :)!
@@ -26,7 +26,7 @@ def packages(state, host, packages=None, present=True, latest=False):
yield ensure_packages(
packages, host.fact.gem_packages, present,
- install_command='gem instal',
+ install_command='gem install',
uninstall_command='gem uninstall',
upgrade_command='gem update',
version_join=':',
