update electron to v43

electron/node_modules/electron-osx-sign/bin/electron-osx-flat-usage.txt

@@ -1,41 +0,0 @@
-
-NAME
-  electron-osx-flat -- product building for Electron apps
-
-SYNOPSIS
-  electron-osx-flat app [options ...]
-
-DESCRIPTION
-  app
-    Path to the application package.
-    Needs file extension ``.app''.
-
-  --help
-    Flag to display all commands.
-
-  --identity=identity
-    Name of certificate to use when signing.
-    Default to selected with respect to --platform from --keychain specified or keychain by system default.
-
-  --identity-validation, --no-identity-validation
-    Flag to enable/disable validation for the signing identity.
-
-  --install=install-path
-    Path to install the bundle.
-    Default to ``/Applications''.
-
-  --keychain=keychain
-    The keychain name.
-    Default to system default keychain.
-
-  --platform=platform
-    Build platform of Electron.
-    Allowed values: ``darwin'', ``mas''.
-    Default to auto detect from application bundle.
-
-  --pkg
-    Path to the output the flattened package.
-    Needs file extension ``.pkg''.
-
-  --scripts
-    Path to a directory containing pre and/or post install scripts.