[[CHORE]] Relocate development dependency

The `unicode-5.2.0` npm module is not necessary when running JSHint; it
is included in this project only during development for the purposes of
generating static data. Relocate the reference to the package in the
project's manifest so that it is not needlessly downloaded by consumers
during typical package installation. Simplify the related logic which
dynamically loaded the latest unicode module to instead load via a
static string value.

package.json

@@ -46,8 +46,7 @@
     "lodash": "~4.17.10",
     "minimatch": "~3.0.2",
     "shelljs": "0.3.x",
-    "strip-json-comments": "1.0.x",
-    "unicode-5.2.0": "^0.7.5"
+    "strip-json-comments": "1.0.x"
   },
   "devDependencies": {
     "async": "~2.1.2",
@@ -65,6 +64,7 @@
     "results-interpreter": "~1.0.0",
     "sinon": "1.12.x",
     "test262-stream": "~1.1.0",
+    "unicode-5.2.0": "^0.7.5",
     "unicode-11.0.0": "0.7.x"
   },
   "license": "(MIT AND JSON)",

scripts/generate-identifier-data.js

@@ -4,10 +4,7 @@
 
 var regenerate = require('regenerate');
 
-// Which Unicode version should be used?
-var pkg = require('../package.json');
-var dependencies = Object.keys(pkg.devDependencies);
-var unicodeVersion = dependencies.find((name) => /^unicode-\d/.test(name));
+var unicodeVersion = 'unicode-11.0.0';
 var oldUnicodeVersion = 'unicode-5.2.0';
 
 // Shorthand functions.