Release 1.4

Most notable changes:
 2019-03-03 f881170 actionless fix(conflicts, install_cli): count repo packages which are going to be installed when computing aur conflicts
 2019-03-03 d8f4234 actionless fix(install_cli), test(basic: conflict): returncode when aur package conflicts with repo package
 2019-02-26 982d046 actionless feat(print dept: print ignored): improve template
 2019-02-16 ecbab8a Hans-Nikolai Viessmann add support to store signature file in package cache (#350)
 2019-02-02 aaae30a Versus Void Raise error when PKGBUILD is absent or ill-formated.
 2019-02-02 449e946 Versus Void Default to PKGBUILD when no positional args supplied.
 2019-01-26 a041c95 bmccorm2 Update README.md
 2019-01-16 003daae actionless fix(install_cli): apply the previous fix also for Arch News thread
 2019-01-16 6bd9343 actionless fix(install_cli): correctly reraise exception from refresh pkg db thread
 2019-01-14 9a4f09d Bundy01 Translation update ES, FR
 2019-01-13 979c1ee actionless feat(install cli): when --needed: exclude from prompt repo and non-devel aur pkgs