Commits on May 30, 2019

1. Retrieve user's keymap path only once …

   Previously, we would retrieve all the active key bindings and filter out 
   the ones that were not defined by the user. The filtering code would 
   repeatedly call `atom.keymaps.getUserKeymapPath` for every loaded key 
   binding, which had the unfortunate side effect of issuing a `statSync` 
   call to check whether the custom keymap file existed or not.
   
   This commit changes the package to only retrieve the user's keymap path 
   once. This consistently reduces Atom startup time by ~50ms on my SSD. 
   Since it was almost entirely I/O work, I would imagine this having an 
   even more significant impact on HDDs.

   Antonio Scandurra committed May 30, 2019
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