Do not run CLI tests on Node 4

Author: axic

test/index.js

@@ -1,6 +1,12 @@
+const semver = require('semver');
+
 require('./linker.js');
 require('./translate.js');
 require('./package.js');
 require('./abi.js');
-require('./cli.js');
 require('./determinism.js');
+
+// The CLI doesn't support Node 4
+if (semver.gte(process.version, '5.0.0')) {
+  require('./cli.js');
+}