Move dx-tools on tag stable v19.2 (#1072)

Author: OlegKipchatov

package.json

@@ -47,7 +47,7 @@
     "devexpress-diagram": "^0.1.43",
     "devexpress-gantt": "0.0.8",
     "devextreme": "~19.2.5-build-19347-0331",
-    "devextreme-internal-tools": "^1.0.0",
+    "devextreme-internal-tools": "stable",
     "dot": "^1.0.3",
     "gulp": "^4.0.0",
     "gulp-header": "^1.8.8",