ci: attempt to fix chromedriver for Appveyor

scripts/patchChromedriver.js

@@ -0,0 +1,10 @@
+// Appveyor current only ships Chrome 65
+// which is no longer supported by the latest version of Chromedriver.
+
+const fs = require('fs')
+const path = require('path')
+const pkg = require('../package.json')
+
+pkg.resolutions.chromedriver = '2.38.0'
+
+fs.writeFileSync(path.resolve(__dirname, '../package.json'), JSON.stringify(pkg, null, 2))