fix: use SpectreMitigation attribute (#13)

binding.gyp

@@ -7,20 +7,21 @@
           "sources": [
             "src/winregistry.cc"
           ],
-          'msvs_settings': {
-            'VCCLCompilerTool': {
-              'AdditionalOptions': [
-                '/W3',
-                '/Qspectre',
-                '/guard:cf',
-                '/we4244',
-                '/we4267',
-                '/ZH:SHA_256'
+          "msvs_configuration_attributes": {
+            "SpectreMitigation": "Spectre"
+          },
+          "msvs_settings": {
+            "VCCLCompilerTool": {
+              "AdditionalOptions": [
+                "/guard:cf",
+                "/we4244",
+                "/we4267",
+                "/ZH:SHA_256"
               ]
             },
-            'VCLinkerTool': {
-              'AdditionalOptions': [
-                '/guard:cf'
+            "VCLinkerTool": {
+              "AdditionalOptions": [
+                "/guard:cf"
               ]
             }
           },