Update Muon version

Auditors: @bridiver

Author: bsclifton

.npmrc

@@ -1,7 +1,7 @@
 runtime = electron
 target_arch = x64
-brave_electron_version = 4.1.4
+brave_electron_version = 4.2.2
 chromedriver_version = 2.29
-target = v4.1.4
+target = v4.2.2
 disturl=https://brave-laptop-binaries.s3.amazonaws.com/atom-shell/dist/
 build_from_source = true

tools/cibuild.py

@@ -4,7 +4,7 @@
 import subprocess
 import sys
 import os.path
-MUON_VERSION = '4.1.4'
+MUON_VERSION = '4.2.2'
 CHROMEDRIVER_VERSION = '2.29'
 SOURCE_ROOT = os.path.abspath(os.path.dirname(os.path.dirname(__file__)))
 TARGET_ARCH= os.environ['TARGET_ARCH'] if os.environ.has_key('TARGET_ARCH') else 'x64'