chore(versions): update tsickle to 0.26.0

Author: Karthik K

package-lock.json

@@ -33,7 +33,7 @@
     "core-js": "^2.4.1",
     "rxjs": "^5.5.5",
     "systemjs": "0.19.43",
-    "tsickle": "^0.24.x",
+    "tsickle": "^0.26.0",
     "tslib": "^1.8.0",
     "zone.js": "^0.8.18"
   },
@@ -77,7 +77,7 @@
     "gulp-clean-css": "^3.9.0",
     "gulp-cli": "^1.3.0",
     "gulp-connect": "^5.0.0",
-    "gulp-conventional-changelog": "^1.1.6",
+    "gulp-conventional-changelog": "^1.1.7",
     "gulp-dom": "^0.9.17",
     "gulp-flatten": "^0.3.1",
     "gulp-highlight-files": "^0.0.5",