--precise argument for the update command was fed test names. This
commit prevents autocompletion of --precise.
'(-h, --help)'{-h,--help}'[show help message]' \
'--manifest-path=[path to manifest]' \
'(-p,--package)'{-p=,--package=}'[package to update]:packages:__get_package_names' \
- '--precise=[update single dependency to PRECISE]: :_test_names' \
+ '--precise=[update single dependency to PRECISE]: :' \
'(-v, --verbose)'{-v,--verbose}'[use verbose output]' \
;;