[emacs] update 15 drones

lib/borg                 master                    v2.0.0-64-g738f749
lib/closql               master                    v0.6.0
lib/company              master                     0.9.6-37-g1f836b6
lib/emacsql              master                     2.0.2-19-g3b70e8f
lib/epkg                 master                    v3.1.0
lib/flycheck             master                     31-156-g0995b0bb
lib/general              master                    e690ef9
lib/helm                 master                    v2.9.7-21-g40a01d97
lib/hydra                master                     0.14.0-17-g87cc74b
lib/ivy                  master                     0.10.0-271-g0cf0e6d
lib/magit                master                     2.13.0-70-g1e2f1686
lib/magit-popup          master                    v2.12.3-4-ge2060cc
lib/notmuch              master                    debian/0.27-1-7-gfd3c9365
lib/use-package          master                     2.3-398-g4f0f585
lib/which-key            master                    v3.3.0-1-g013cdb7

Some were detached, so I checked out their `master'.