Build Electron 4.2 artifacts

4.0 and 4.1 were there but not 4.2

#937

Author: CapOM

packages/grpc-native-core/tools/run_tests/artifacts/build_artifact_electron.bat

@@ -14,7 +14,7 @@
 
 set arch_list=ia32 x64
 
-set electron_versions=1.0.0 1.1.0 1.2.0 1.3.0 1.4.0 1.5.0 1.6.0 1.7.0 1.8.0 2.0.0 3.0.0 3.1.0 4.1.0 5.0.0
+set electron_versions=1.0.0 1.1.0 1.2.0 1.3.0 1.4.0 1.5.0 1.6.0 1.7.0 1.8.0 2.0.0 3.0.0 3.1.0 4.1.0 4.2.0 5.0.0
 
 set PATH=%PATH%;C:\Program Files\nodejs\;%APPDATA%\npm
 

packages/grpc-native-core/tools/run_tests/artifacts/build_artifact_electron.sh

@@ -16,7 +16,7 @@
 set -ex
 
 arch_list=( ia32 x64 )
-electron_versions=( 1.0.0 1.1.0 1.2.0 1.3.0 1.4.0 1.5.0 1.6.0 1.7.0 1.8.0 2.0.0 3.0.0 3.1.0 4.1.0 5.0.0 )
+electron_versions=( 1.0.0 1.1.0 1.2.0 1.3.0 1.4.0 1.5.0 1.6.0 1.7.0 1.8.0 2.0.0 3.0.0 3.1.0 4.1.0 4.2.0 5.0.0 )
 
 umask 022