Move dx-tools on tag stable (#366)

Author: OlegKipchatov

package.json

@@ -39,7 +39,7 @@
     "dasherize": "^2.0.0",
     "del": "^3.0.0",
     "devextreme": "~20.1.3",
-    "devextreme-internal-tools": "^1.0.0",
+    "devextreme-internal-tools": "stable",
     "dot": "^1.1.2",
     "gulp": "^4.0.0",
     "gulp-header": "^2.0.5",