Fix lib to use iOS 10.x JSC base and remove DOM declarations (#164)

Author: newyankeecodeshop

template/tsconfig.json

@@ -4,7 +4,7 @@
     /* Basic Options */
     "target": "esnext",                       /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017','ES2018' or 'ESNEXT'. */
     "module": "commonjs",                     /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
-    "lib": ["es6"],                           /* Specify library files to be included in the compilation. */
+    "lib": ["es2017"],                        /* Specify library files to be included in the compilation. */
     "allowJs": true,                          /* Allow javascript files to be compiled. */
     // "checkJs": true,                       /* Report errors in .js files. */
     "jsx": "react-native",                    /* Specify JSX code generation: 'preserve', 'react-native', or 'react'. */