Bump version to 1.6.0

Author: Constellation

package.json

@@ -15,7 +15,7 @@
     "escodegen.js",
     "package.json"
   ],
-  "version": "1.5.0-dev",
+  "version": "1.6.0",
   "engines": {
     "node": ">=0.10.0"
   },

tools/release.js

@@ -49,9 +49,9 @@ function exec(cmd) {
 
     config = JSON.parse(fs.readFileSync(path.join(root, 'package.json'), 'utf-8'));
     devVersion = config.version;
-    matched = devVersion.match(/^(\d+\.\d+\.\d+(-\d+)?)-dev$/);
+    matched = devVersion.match(/^(\d+\.\d+\.\d+(-\d+)?)$/);
     if (!matched) {
-        console.error('version style "' + devVersion + '" is not matched to X.X.X[-X]-dev.');
+        console.error('version style "' + devVersion + '" is not matched to X.X.X[-X].');
         process.exit(1);
     }